19、C

Grown-ups know that people and objects are solid. At the movies, we know that if we reach out to touch Tom Cruise, all we will feel is air. But does a baby have this understanding?

To see whether babies know objects are solid, T. Bower designed a method for projecting an optical illusion(視覺(jué)影像) of a hanging ball. His plan was to first give babies a real ball, one they could reach out and touch, and then to show them the illusion. If they knew that objects are solid and they reached out for the illusion and found empty air, they could be expected to show surprise in their faces and movements. All the 16-to 24- week -old babies tested were surprised when they reached for the illusion and found that the ball was not there.

Grown-ups also have a sense of object permanence. We know that if we put a box in a room and lock the door, the box will still be there when we come back. But does a baby realize that a ball that rolls under a chair does not disappear and go to never-never land?

Experiments done by Bower suggest that babies develop a sense of object permanence when they are about 18 weeks old. In his experiments, Bower used a toy train that went behind a screen. When 16-week-old and 22-week-old babies watched the toy train disappear behind the left side of the screen, they looked to the right, expecting it to reappear. If the experimenter took the train off the table and lifted the screen, all the babies seemed surprised not to see the train. This seems to show that all the babies had a sense of object permanence. But the second part of the experiment showed that this was not really the case. The researcher substituted a ball for the train when it went behind the screen. The 22-week-old babies seemed surprised and looked back to the left side for the train. But the 16-week -old babies did not seem to notice the switch. Thus, the 16-week-old babies seemed to have a sense of “something permanence,” while the 22-week-old babies had a sense of object permanence related to a particular object.

64. The passage is mainly about _____.

A. babies' sense of sight              B. effects of experiments on babies

C. babies' understanding of objects     D. different tests on babies' feelings

65. In Paragraph 3, “object permanence” means that when out of sight, an object _____.

A. still exists   B. keeps its shape    C. still stays solid     D. is beyond reach

66. What did Bower use in his experiments?

A. A chair.      B. A screen.        C. A film.           D. A box.

67. Which of the following statements is true?

A. The babies didn't have a sense of direction. 

B. The older babies preferred toy trains to balls.

C. The younger babies liked looking for missing objects.

D. The babies couldn't tell a ball from its optical illusion.

19、  CABD

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相關(guān)習(xí)題

科目:高中英語(yǔ) 來(lái)源: 題型:閱讀理解

    Grown-ups know that people and objects are solid. At the movies, we know that if we reach out to touch Tom Cruise, all we will feel is air. But does a baby have this understanding?

    To see whether babies know objects are solid, T. Bower designed a method for projecting an optical illusion(視覺(jué)影像)of a hanging ball. His plan was to first give babies a real ball, one they could reach out and touch, and then to show them the illusion. If they knew that objects are solid and they reached out for the illusion and found empty air, they could be expected to show surprise in their faces and movements. All the 16-to 24- week -old babies tested were surprised when they reached for the illusion and found that the ball was not there.

    Grown-ups also have a sense of object permanence. We know that if we put a box in a room and lock the door, the box will still be there when we come back. But does a baby realize that a ball that rolls under a chair does not disappear and go to never-never land?

    Experiments done by Bower suggest that babies develop a sense of object permanence when they are about 18 weeks old. In his experiments, Bower used a toy train that went behind a screen. When 16-week-old and 22-week-old babies watched the toy train disappear behind the left side of the screen, they looked to the right, expecting it to reappear. If the experimenter took the train off the table and lifted the screen, all the babies seemed surprised not to see the train. This seems to show that all the babies had a sense of object permanence. But the second part of the experiment showed that this was not really the case. The researcher substituted(替換)a ball for the train when it went behind the screen. The 22-week-old babies seemed surprised and looked back to the left side for the train. But the 16-week -old babies did not seem to notice the switch(更換). Thus, the 16-week-old babies seemed to have a sense of “something permanence,” while the 22-week-old babies had a sense of object permanence related to a particular object.

68. The passage is mainly about _____.

      A. babies’ sense of sight                   B. effects of experiments on babies

       C. babies’ understanding of objects          D. different tests on babies’ feelings

69. In Paragraph 3, “object permanence” means that when out of sight, an object ________.

       A. still exists     B. keeps its shape         C. still stays solid        D. is beyond reach

70. What did Bower use in his experiments?

       A. A chair.         B. A screen.       C. A film.          D. A box.

71. Which of the following statements is true?

       A. The babies didn’t have a sense of direction.

      B. The older babies preferred toy trains to balls.

   C. The younger babies liked looking for missing objects.

   D. The babies couldn’t tell a ball from its optical illusion.

查看答案和解析>>

科目:高中英語(yǔ) 來(lái)源: 題型:閱讀理解

Grown-ups know that people and objects are solid. At the movies, we know that if we reach out to touch Tom Cruise, all we will feel is air. But does a baby have this understanding?

To see whether babies know objects are solid, T. Bower designed a method for projecting an optical illusion of a hanging ball. His plan was to first give babies a real ball, one they could reach out and touch, and then to show them the illusion. If they knew that objects are solid and they reached out for the illusion and found empty air, they could be expected to show surprise in their faces and movements. All the 16 to 24-week-old babies tested were surprised when they reached for the illusion and found that the ball was not there.

Grown-ups also have a sense of object permanence. We know that if we put a box in a room and lock the door, the box will still be there when we come back. But does a baby realize that a ball that rolls under a chair does not disappear and go to never-never land?

Experiments done by Bower suggest that babies develop a sense of object permanence when they are about 18 weeks old. In his experiments, Bower used a toy train that went behind a screen. When 16-week-old and 22-week-old babies watched the toy train disappear behind the left side of the screen, they looked to the right, expecting it to reappear. If the experimenter took the train off the table and lifted the screen, all the babies seemed surprised not to see the train. This seems to show that all the babies had a sense of object permanence. But the second part of the experiment showed that this was not really the case. The researcher substituted a ball for the train when it went behind the screen. The 22-week-old babies seemed surprised and looked back to the left side for the train. But the 16-week-old babies did not seem to notice the switch. Thus, the 16-week-old babies seemed to have a sense of “something permanence, while the 22-week-old babies had a sense of object permanence related to a particular object.

The passage is mainly about _____.

       A. babies’ sense of sight          

       B. effects of experiments on babies

       C. babies’ understanding of objects

       D. different tests on babies’ feelings

In Paragraph 3, “object permanence” means that when out of sight, an object ________.

       A. still exists                        B. keeps its shape

       C. still stays solid                        D. is beyond reach

What did Bower use in his experiments?

       A. A chair.     B. A screen.          C. A film.      D. A box.

Which of the following statements is true?

       A. The babies didn’t have a sense of direction.   

       B. The older babies preferred toy trains to balls.

       C. The younger babies liked looking for missing objects.   

       D. The babies couldn’t tell a ball from its optical illusion.

查看答案和解析>>

科目:高中英語(yǔ) 來(lái)源:2013屆湖北省部分重點(diǎn)中學(xué)高三秋季期中聯(lián)考英語(yǔ)試卷(帶解析) 題型:閱讀理解


Grown-ups know that people and objects are solid. At the movies, we know that if we reach out to touch Tom Cruise, all we will feel is air. But does a baby have this understanding?
To see whether babies know objects are solid, T. Bower designed a method for projecting an optical illusion of a hanging ball. His plan was to first give babies a real ball, one they could reach out and touch, and then to show them the illusion. If they knew that objects are solid and they reached out for the illusion and found empty air, they could be expected to show surprise in their faces and movements. All the 16- to 24-week-old babies tested were surprised when they reached for the illusion and found that the ball was not there.
Grown-ups also have a sense of object permanence, We know that if we put a box in a room and lock the door, the box will still be there when we come back. But does a baby realize that a ball that rolls under a chair does not disappear and go to never-never land?
Experiments done by Bower suggest that babies develop a sense of object permanence when they are about 18 weeks old. In his experiments, Bower used a toy train that went behind a screen. When 16-week-old and 22-week-old babies watched the toy train disappear behind the left side of the screen, they looked to the right, expecting it to reappear. If the experimenter took the train off the table and lifted the screen, all the babies seemed surprised not to see the train. This seems to show that all the babies had a sense of object permanence. But the second part of the experiment showed that this was not really the case. The researcher substituted a ball for the train when it went behind the screen. The 22-week-old babies seemed surprised and looked back to the left side for the train. But the 16-week-old babies did not seem to notice the switch. Thus, the 16-week-old babies seem to have a sense of “something permanence,” while the 22-week-old babies had a sense of object permanence related to a particular object.
【小題1】 The passage is mainly about          .

A.babies’ understanding of objectsB.effects of experiments on babies
C.babies’ sense of sightD.different tests on babies’ feelings
【小題2】 In Paragraph 3, “object permanence” means that when out of sight, an object         .
A.still existsB.keeps its shapeC.still stays solidD.is beyond reach
【小題3】. What did Bower use in his experiments?
A.A chair.B.A screen.C.A film.D.A box.
【小題4】. Which of the following statements is true?
A.The babies didn’t have a sense of direction.
B.The older babies preferred toy trains to balls.
C.The younger babies liked looking for missing objects.
D.The babies couldn’t tell a ball from its optical illusion.

查看答案和解析>>

科目:高中英語(yǔ) 來(lái)源:2012屆廣西省桂林十八中高三第二次月考英語(yǔ)卷 題型:閱讀理解

Grown-ups know that people and objects are solid. At the movies, we know that if we reach out to touch Tom Cruise, all we will feel is air. But does a baby have this understanding?
To see whether babies know objects are solid, T. Bower designed a method for projecting an optical illusion(視覺(jué)影像) of a hanging ball. His plan was to first give babies a real ball, one they could reach out and touch, and then to show them the illusion. If they knew that objects are solid and they reached out for the illusion and found empty air, they could be expected to show surprise in their faces and movements. All the 16-to 24- week -old babies tested were surprised when they reached for the illusion and found that the ball was not there.
Grown-ups also have a sense of object permanence. We know that if we put a box in a room and lock the door, the box will still be there when we come back. But does a baby realize that a ball that rolls under a chair does not disappear and go to never-never land?
Experiments done by Bower suggest that babies develop a sense of object permanence when they are about 18 weeks old. In his experiments, Bower used a toy train that went behind a screen. When 16-week-old and 22-week-old babies watched the toy train disappear behind the left side of the screen, they looked to the right, expecting it to reappear. If the experimenter took the train off the table and lifted the screen, all the babies seemed surprised not to see the train. This seems to show that all the babies had a sense of object permanence. But the second part of the experiment showed that this was not really the case. The researcher substituted a ball for the train when it went behind the screen. The 22-week-old babies seemed surprised and looked back to the left side for the train. But the 16-week -old babies did not seem to notice the switch. Thus, the 16-week-old babies seemed to have a sense of “something permanence,” while the 22-week-old babies had a sense of object permanence related to a particular object.
【小題1】The passage is mainly about _____.

A.babies' sense of sightB.effects of experiments on babies
C.babies' understanding of objectsD.different tests on babies' feelings
【小題2】In Paragraph 3, “object permanence” means that when out of sight, an object _____.
A.still existsB.keeps its shapeC.still stays solidD.is beyond reach
【小題3】What did Bower use in his experiments?
A.A chair.B.A screen.C.A film.D.A box.
【小題4】Which of the following statements is true?
A.The babies didn't have a sense of direction.
B.The older babies preferred toy trains to balls.
C.The younger babies liked looking for missing objects.
D.The babies couldn't tell a ball from its optical illusion.

查看答案和解析>>

科目:高中英語(yǔ) 來(lái)源:2012-2013學(xué)年浙江省溫州中學(xué)高二上學(xué)期期中考試英語(yǔ)試卷(帶解析) 題型:閱讀理解


Grown-ups know that people and objects are solid. At the movies, we know that if we reach out to touch Tom Cruise, all we will feel is air. But does a baby have this understanding?
To see whether babies know objects are solid. T. Bower designed a method for projecting an optical illusion (視覺(jué)影像) of a hanging ball. His plan was to first give babies a real ball, one they could be expected to show surprise in their faces and movements. All the 16 to 24-week-old babies tested were surprised when they reached for the illusion and found that the ball was not there.
Grown-ups also have a sense of object permanence. We know that if we put a box in a room and lock the door, the box will still be there when we come back. But does a baby realize that a ball that rolls under a chair does not disappear and go to never-never land (想像中的地方)?
Experiments done by Bower suggest that babies develop a sense of object permanence when they are about 18 weeks old. In his experiments, Bower used a toy train that went behind a screen. When 16-week-old and 22-week-old babies watched the toy train disappear behind the left side of the screen, they looked to the right, expecting it to re-appear. If the experiment took the train off the table and lifted the screen, all the babies seemed surprised not to see the train. This seems to show that all the babies had a sense of object permanence. But the second part of the experiment showed that this was not really the case. The researcher substituted (替換) a ball for the train when it went behind the screen. The 22-week-old babies seemed surprised and looked back to the left side for the train. But the 16-week-old babies did not seem to notice the switch (更換). Thus, the 16-week-old babies seemed to have a sense of “something permanence,” while the 22-week-old babies had a sense of object permanence related to a particular object.
【小題1】The passage is mainly about ______.

A.babies’ sense of sight
B.effects of experiments on babies
C.babies’ understanding of objects
D.different tests on babies’ feelings
【小題2】. In Paragraph 3, “object permanence” means that when out of sight, “object ______”.
A.still existsB.keeps its shape C.still stays solidD.is beyond reach
【小題3】. What did Bower use in his experiments?
A.A chair & a screenB.A screen & a trainC.A film & a train D.A box & a chair
【小題4】 Which of the following statements is true?
A.The babies didn’t have a sense of direction.
B.The older babies preferred toy trains to balls.
C.The younger babies liked looking for missing objects
D.The babies couldn’t tell a ball from its optical illusion.

查看答案和解析>>

科目:高中英語(yǔ) 來(lái)源:2011福建莆田十中高三5月月考英語(yǔ)試卷 題型:閱讀理解

Grown-ups know that people and objects are solid. At the movies, we know that if we reach out to touch Tom Cruise, all we will feel is air. But does a baby have this understanding?
To see whether babies know objects are solid. T. Bower designed a method for projecting an optical illusion(視覺(jué)影像)of a hanging ball. His plan was to first give babies a real ball, one they could be expected to show surprised in their faces and movements, All the 16 to 24-week-old babies tested were surprised when they reached for the illusion and found that the ball was not there.
Grown-ups also have a sense of object permanence. We know that if we put a box in a room and lock the door, the box will still be there when we come back. But does a baby realize that a ball that rolls under a chair does not disappear and go to never-never land?
Experiments done by Bower suggest that babies develop a sense of object permanence when they are about 18 weeks old. In his experiments, Bower used a toy train that went behind a screen. When 16-week-old and 22-week-old babies watched the toy train disappear behind the left side of the screen, they looked to the right, expecting it to re-appear. If the experiment took the train off the table and lifted the screen, all the babies seemed surprised not to see the train. This seems to show that all the babies had a sense of object permanence. But the second part of the experiment showed that this was not really the case. The re-searcher substituted(替換) a ball for the train when it went behind the screen. The 22-week-old babies seemed surprised and looked back to the left side for the train. But the 16-week-old babies did not seem to notice the switch(更換).Thus,the 16-week-old babies seemed to have a sense of “something permanence,” while the 22-week-old babies had a sense of object permanence related to a particular object.
【小題1】The passage is mainly about        .

A.babies’sense of sightB.effects of experiments on babies
C.babies’understanding of objectsD.different tests on babies’feelings
【小題2】.In Paragraph 3, “object permanence” means that when out of sight, and object           .
A.still existsB.keeps its shapeC.still stays solid D.is beyond reach
【小題3】.What did Bower use in his experiments?
A.A chairB.A screenC.A filmD.A box
【小題4】. Which of the following statements is TRUE?
A.The babies didn’t have a sense of direction.
B.The older babies preferred toy trains to balls.
C.The younger babies liked looking for missing objects
D.The babies couldn’t tell a ball from its optical illusion.

查看答案和解析>>

科目:高中英語(yǔ) 來(lái)源:2012屆安徽省銅陵三中高三英語(yǔ)綜合測(cè)試卷二 題型:閱讀理解

Grown-ups know that people and objects are solid. At the movies, we know that if we reach out to touch Tom Cruise, all we will feel is air. But does a baby have this understanding?
To see whether babies know objects are solid. T. Bower designed a method for projecting an optical illusion (視覺(jué)影像) of a hanging ball. His plan was to first give babies a real ball, one they could be expected to show surprised in their faces and movements. All the 16 to 24-week-old babies tested were surprised when they reached for the illusion and found that the ball was not there.
Grown-ups also have a sense of object permanence. We know that if we put a box in a room and lock the door, the box will still be there when we come back. But does a baby realize that a ball that rolls under a chair does not disappear and go to never-never land?
Experiments done by Bower suggest that babies develop a sense of object permanence when they are about 18 weeks old. In his experiments, Bower used a toy train that went behind a screen. When 16-week-old and 22-week-old babies watched the toy train disappear behind the left side of the screen, they looked to the right, expecting it to re-appear. If the experiment took the train off the table and lifted the screen, all the babies seemed surprised not to see the train. This seems to show that all the babies had a sense of object permanence. But the second part of the experiment showed that this was not really the case. The researcher substituted (替換) a ball for the train when it went behind the screen. The 22-week-old babies seemed surprised and looked back to the left side for the train. But the 16-week-old babies did not seem to notice the switch (更換). Thus, the 16-week-old babies seemed to have a sense of “something permanence,” while the 22-week-old babies had a sense of object permanence related to a particular object.
【小題1】The passage is mainly about         .

A.babies’ sense of sightB.effects of experiments on babies
C.babies’ understanding of objectsD.different tests on babies’ feelings
【小題2】In Paragraph 3, object permanence means that when out of sight, an object            .
A.still existsB.keeps its shapeC.still stays solidD.is beyond reach
【小題3】What did Bower use in his experiments?
A.A chairB.A screenC.A filmD.A box
【小題4】Which of the following statements is true?
A.The babies didn’t have a sense of direction.
B.The older babies preferred toy trains to balls.
C.The younger babies liked looking for missing objects
D.The babies couldn’t tell a ball from its optical illusion.

查看答案和解析>>

科目:高中英語(yǔ) 來(lái)源:2013屆湖北省高三秋季期中聯(lián)考英語(yǔ)試卷(解析版) 題型:閱讀理解

Grown-ups know that people and objects are solid. At the movies, we know that if we reach out to touch Tom Cruise, all we will feel is air. But does a baby have this understanding?

To see whether babies know objects are solid, T. Bower designed a method for projecting an optical illusion of a hanging ball. His plan was to first give babies a real ball, one they could reach out and touch, and then to show them the illusion. If they knew that objects are solid and they reached out for the illusion and found empty air, they could be expected to show surprise in their faces and movements. All the 16- to 24-week-old babies tested were surprised when they reached for the illusion and found that the ball was not there.

Grown-ups also have a sense of object permanence, We know that if we put a box in a room and lock the door, the box will still be there when we come back. But does a baby realize that a ball that rolls under a chair does not disappear and go to never-never land?

Experiments done by Bower suggest that babies develop a sense of object permanence when they are about 18 weeks old. In his experiments, Bower used a toy train that went behind a screen. When 16-week-old and 22-week-old babies watched the toy train disappear behind the left side of the screen, they looked to the right, expecting it to reappear. If the experimenter took the train off the table and lifted the screen, all the babies seemed surprised not to see the train. This seems to show that all the babies had a sense of object permanence. But the second part of the experiment showed that this was not really the case. The researcher substituted a ball for the train when it went behind the screen. The 22-week-old babies seemed surprised and looked back to the left side for the train. But the 16-week-old babies did not seem to notice the switch. Thus, the 16-week-old babies seem to have a sense of “something permanence,” while the 22-week-old babies had a sense of object permanence related to a particular object.

1. The passage is mainly about          .

A.babies’ understanding of objects

B.effects of experiments on babies

C.babies’ sense of sight

D.different tests on babies’ feelings

2. In Paragraph 3, “object permanence” means that when out of sight, an object         .

A.still exists

B.keeps its shape

C.still stays solid

D.is beyond reach

3.. What did Bower use in his experiments?

A.A chair.

B.A screen.

C.A film.

D.A box.

4.. Which of the following statements is true?

A.The babies didn’t have a sense of direction.

B.The older babies preferred toy trains to balls.

C.The younger babies liked looking for missing objects.

D.The babies couldn’t tell a ball from its optical illusion.

 

查看答案和解析>>

科目:高中英語(yǔ) 來(lái)源:2012-2013學(xué)年浙江省高二上學(xué)期期中考試英語(yǔ)試卷(解析版) 題型:閱讀理解

Grown-ups know that people and objects are solid. At the movies, we know that if we reach out to touch Tom Cruise, all we will feel is air. But does a baby have this understanding?

To see whether babies know objects are solid. T. Bower designed a method for projecting an optical illusion (視覺(jué)影像) of a hanging ball. His plan was to first give babies a real ball, one they could be expected to show surprise in their faces and movements. All the 16 to 24-week-old babies tested were surprised when they reached for the illusion and found that the ball was not there.

Grown-ups also have a sense of object permanence. We know that if we put a box in a room and lock the door, the box will still be there when we come back. But does a baby realize that a ball that rolls under a chair does not disappear and go to never-never land (想像中的地方)?

Experiments done by Bower suggest that babies develop a sense of object permanence when they are about 18 weeks old. In his experiments, Bower used a toy train that went behind a screen. When 16-week-old and 22-week-old babies watched the toy train disappear behind the left side of the screen, they looked to the right, expecting it to re-appear. If the experiment took the train off the table and lifted the screen, all the babies seemed surprised not to see the train. This seems to show that all the babies had a sense of object permanence. But the second part of the experiment showed that this was not really the case. The researcher substituted (替換) a ball for the train when it went behind the screen. The 22-week-old babies seemed surprised and looked back to the left side for the train. But the 16-week-old babies did not seem to notice the switch (更換). Thus, the 16-week-old babies seemed to have a sense of “something permanence,” while the 22-week-old babies had a sense of object permanence related to a particular object.

1.The passage is mainly about ______.

A.babies’ sense of sight

B.effects of experiments on babies

C.babies’ understanding of objects

D.different tests on babies’ feelings

2.. In Paragraph 3, “object permanence” means that when out of sight, “object ______”.

A.still exists

B.keeps its shape

C.still stays solid

D.is beyond reach

3.. What did Bower use in his experiments?

A.A chair & a screen

B.A screen & a train

C.A film & a train

D.A box & a chair

4. Which of the following statements is true?

A.The babies didn’t have a sense of direction.

B.The older babies preferred toy trains to balls.

C.The younger babies liked looking for missing objects

D.The babies couldn’t tell a ball from its optical illusion.

 

查看答案和解析>>

科目:高中英語(yǔ) 來(lái)源:2011-2012學(xué)年廣西省高三第二次月考英語(yǔ)題 題型:閱讀理解

Grown-ups know that people and objects are solid. At the movies, we know that if we reach out to touch Tom Cruise, all we will feel is air. But does a baby have this understanding?

To see whether babies know objects are solid, T. Bower designed a method for projecting an optical illusion(視覺(jué)影像) of a hanging ball. His plan was to first give babies a real ball, one they could reach out and touch, and then to show them the illusion. If they knew that objects are solid and they reached out for the illusion and found empty air, they could be expected to show surprise in their faces and movements. All the 16-to 24- week -old babies tested were surprised when they reached for the illusion and found that the ball was not there.

Grown-ups also have a sense of object permanence. We know that if we put a box in a room and lock the door, the box will still be there when we come back. But does a baby realize that a ball that rolls under a chair does not disappear and go to never-never land?

Experiments done by Bower suggest that babies develop a sense of object permanence when they are about 18 weeks old. In his experiments, Bower used a toy train that went behind a screen. When 16-week-old and 22-week-old babies watched the toy train disappear behind the left side of the screen, they looked to the right, expecting it to reappear. If the experimenter took the train off the table and lifted the screen, all the babies seemed surprised not to see the train. This seems to show that all the babies had a sense of object permanence. But the second part of the experiment showed that this was not really the case. The researcher substituted a ball for the train when it went behind the screen. The 22-week-old babies seemed surprised and looked back to the left side for the train. But the 16-week -old babies did not seem to notice the switch. Thus, the 16-week-old babies seemed to have a sense of “something permanence,” while the 22-week-old babies had a sense of object permanence related to a particular object.

1.The passage is mainly about _____.

A.babies' sense of sight

B.effects of experiments on babies

C.babies' understanding of objects

D.different tests on babies' feelings

2.In Paragraph 3, “object permanence” means that when out of sight, an object _____.

A.still exists

B.keeps its shape

C.still stays solid

D.is beyond reach

3.What did Bower use in his experiments?

A.A chair.

B.A screen.

C.A film.

D.A box.

4.Which of the following statements is true?

A.The babies didn't have a sense of direction.

B.The older babies preferred toy trains to balls.

C.The younger babies liked looking for missing objects.

D.The babies couldn't tell a ball from its optical illusion.

 

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