How long has 3-D technology been around? Most of us might think of crowds of teenagers in a 1950’s movie house watching Bwana Devil in 3-D. But 3-D technology made its first appearance on the scene in 1838 with the first stereoscope(體視鏡). And the first actual 3-D movie was a 1903 film called Le Ariveed’un Train.

Although it has such a long history, the technology has still remained based on one simple principle-----to make 3-D effects you must find a way to project two slightly different pictures to each eye. Modern 3-D technology works by rapidly flickering(閃動(dòng)) two versions of the movie and projecting them onto each eye. The brain does the rest of the work, combining the two pictures together into one and giving the show the appearance of depth, the third dimension.

But does this exposure, especially long exposures, cause harm to the child’s developing brain and visual system? Unfortunately, long-term studies on new flicker digital 3-D technology and children aren’t yet available. We do not know if regular or daily 3-D viewing over years affects the developing visual system, although older 3-D methods basically do the same thing and are not considered harmful.

The question of possible harm in modern 3-D use in TV is really based on two facts: the amount of time children will now be watching 3-D TV each day and the sensitivity some children show in reaction to 3-D viewing. It is difficult to make actual lab studies of longer term 3-D viewing in children because of the possible harm of the experiment. Researchers will have to wait until 3-D TV technology is already in the marketplace for a number of years, then check heavy 3-D TV watchers and compare them with non-watchers.

With a 3-D television technology in the home, we will soon be able to answer the question of whether or not longer and more frequent periods of 3-D exposure cause more changes in the visual system. We may find that the bigger problem is the introduction of a new technology that leads to even more time spent on TV rather than playing outdoors.

1.According to the text, 3-D technology ______

A. was refused by people when it first appeared.

B. will soon change the way we watch TV.

C. does no good to our visual system.

D. has a history of nearly 200 years.

2.Paragraph 2 is mainly about________

A. how 3-D technology works.

B. why 3-D movies are popular

C. the history of 3-D technology.

D. the influence of 3-D technology.

3.What’s the method suggested in paragraph 4?

A. To wait and see B. To carry out lab studies

C. To stop making 3-D movies D. To improve 3-D technology

4.The author’s purpose in writing the text is to _______

A. ask children not to watch 3-D movies

B. discuss if 3-D viewing is harmful to children.

C. introduce the advantages of 3-D technology.

D. predict the development of 3-D technology.

練習(xí)冊系列答案
相關(guān)習(xí)題

科目：高中英語 來源： 題型：閱讀理解

11．As world travel increases，nations learn from each other．In the United States today there are many evidences of this fact．
One of the latest imports is acupuncture（針灸），the use of needles for treating diseases．Although acupuncture has been practiced in China for more than 2，000years，its use in the Western world is still very new．Several hospitals in the United States are now experimenting with acupuncture as a way of treating pain．
An American journalist who stood beside a patient during an operation in Shanghai recently described the process and its effects．To keep the patient from feeling pain during the operation，four needles were used，each about an inch and a half long．Two needles were inserted under the skin on each side of the patient's neck．The tops of the needles were attached to wires which led to a small electrical device．
Throughout the operation the patient talked calmly to those standing around him，insisting that he felt perfectly normal．At one point he stretched out his hands and moved his bare toes to show that only his chest and neck were affected．
How does acupuncture work？How is it able to keep a patient from feeling pain？No very satisfactory answer has been given，but there are at least three theories．Some doctors believe that acupuncture somehow produces an effect upon the central nervous system．Others believe that acupuncture produces a chemical change in the body's fluid．Still another theory is that the needles make contact with an unknown system of energy in the body which travels along certain routes under the skin．The true explanation may be one of these or a combination of more than one．It may be something entirely different．
28．At one point during the operation，the patient moved his hands and toes to show thatD．
A．he felt no pain at all
B．his hands and toes were painful
C．the operation was quite a success
D．he felt quite normal except his chest and neck
29．Several hospitals in the United States are nowB．
A．testing the effect of acupuncture on pain
B．practicing acupuncture as a way of treating disease
C．importing needles for experimental use
D．doing operation on patients'chest and neck
30．Which of the following is true？C
A．Acupuncture has been practiced in the western countries for more than a century．
B．Although acupuncture works well on pain，how it really works remains unknown．
C．There are already three satisfactory theories on how acupuncture works．
D．The effect of acupuncture on pain is still doubted by the Western World．
31．It can be learned from the passage thatA．
A．a(chǎn)cupuncture has existed in china for over 2，000years
B．the Chinese mainly use acupuncture to treat strange diseases
C．the needles can work without any device
D．Throughout the operation the patient can do everything he wanted．

查看答案和解析>>

科目：高中英語 來源： 題型：書面表達(dá)

10．假定你是李華，想邀請外教Henry一起參觀中國剪紙（paper-cutting）藝術(shù)展．請給他寫封郵件，內(nèi)容包括：
1．展覽時(shí)間、地點(diǎn)；
2．展覽內(nèi)容．
注意：
1．詞數(shù)100左右；
2．可以適當(dāng)增加細(xì)節(jié)，以使行文連貫．
Dear Henry，
I'm very delighted to write a letter to tell you something about Chinese paper-cutting exhibition，which will start on June 20 in our school lecture hall and last for a week．（高分句型一）（展覽時(shí)間、地點(diǎn)）As is well-known to us all，Chinese paper-cutting is famous all over the world and I'm sure you will be interested in it，so I plan to invite you to pay a close visit．（高分句型二）The exhibition is a collection of works created by some famous paper-cutting artists in China．（展覽內(nèi)容）During the activity，I will show you around our school and this is a good chance for you to enjoy yourself and learn more about Chinese traditional culture．
Would you please have a look at the exhibition with me？I'd appreciate it if you could accept my invitation．（高分句型三） I'm looking forward to receiving your reply as soon as possible．（殷切希望）
Yours，
Li Hua．

查看答案和解析>>

科目：高中英語 來源：2016-2017學(xué)年江西省南昌市高二上學(xué)期期末考試英語試卷（解析版） 題型：完形填空

“Who can ever have imagined that someone like me would make it this far?” asked Chad Wood last week during his high school graduation speech as the best student. Chad offered ______ to his fellow classmates to never give up-and the words ______ much more to himself. That’s because Chad is deaf, and he told the story of the serious troubles he ______ to graduate first in his class at Harrison High school in Kennesaw, Georgia.

Chad didn’t start to ______ until he was 5, according to his mother, Pam Wood. Although her son was ______ a disadvantage, she was determined not to treat him ______.“I’ve expected him to do everything every other kid does, and I saw no ______ why he couldn’t,” she told ABC News.“And if he ______ the first time, we just tried again.”

Chad, 17, worked hard throughout school, ______ no special treatment but sitting at the front of the class and using a special audio system so he could hear the teacher. All his hard work ______. He received full school fare to Vanderbilt University. “Deafness had taught me a lesson to never ______ ,” he said in the speech. ”Not when the experts tell you it cannot be done. Not when you have ______ so far behind that escaping seems the only way ______. Not when achieving your dreams seems an entire ______.”

Chad spoke for about four minutes, after which he received a standing applause from the class and ______ messages from family, friends and strangers. “They’ve been sending me messages on Facebook, email; they’ve been talking to me in person telling me how it had a ______ on their lives and how they’re really ______ by it,” Chad told ABC News. “It feels ______. Seeing that my words ______ have a power on someone and that they want to work harder ______ my words makes me feel wonderful.”

1.A. warning B. description C. advice D. information

2.A. analysed B. meant C. recognized D. persuaded

3.A. needed B. faced C. consisted D. foresaw

4.A. cry B. write C. smell D. hear

5.A. at B. for C. under D. by

6.A. deadly B. kindly C. differently D. similarly

7.A. harm B. reason C. trouble D. conclusion

8.A. failed B. organized C. succeed D. blamed

9.A. receive B. receiving C. to receive D. received

10.A. set off B. dropped off C. took off D. paid off

11.A. give in B. give up C. give out D. give away

12.A. waited B. walked C. fallen D. gone

13.A. up B. off C. in D. out

14.A. impossibility B. success C. victory D. possibility

15.A. scientific B. negative C. supportive D. cautious

16.A. reward B. power C. source D. detail

17.A. defeated B. exposed C. educated D. puzzled

18.A. unwilling B. amazing C. shocking D. embarrassing

19.A. actually B. suddenly C. strangely D. extremely

20.A. apart from B. according to C. instead of D. because of

查看答案和解析>>

科目：高中英語 來源：2017屆甘肅省天水市高三下學(xué)期第三次診斷考試英語試卷（解析版） 題型：短文改錯(cuò)

假定英語課上老師要求同桌之間交換修改作文，請你修改你同桌寫的以下作文。文中共有10處語言錯(cuò)誤，每句中最多有兩處。每處錯(cuò)誤僅涉及一個(gè)單詞的增加、刪除或修改。

增加：在缺詞處加一個(gè)漏字符號(hào)(∧)，并在其下面寫出該加的詞。

刪除：把多余的詞用斜線(＼)劃掉。

修改：在錯(cuò)的詞下劃一橫線，并在該詞下面寫出修改后的詞。

注意：1．每處錯(cuò)誤及其修改均僅限一詞；

2．只允許修改10處，多者(從第11處起)不計(jì)分。

Some phones had become part of our daily life. No matter who we are, we can see people busy play with their smart phones. Smart phones benefit them. They help us escape the pressure of life and get informations. However, if we spend too much time on them, we won’t have time to contact face to face our friends and family. And our life, study and work will hurt. In my view, we should limit to our using smart phones except for a purpose of learning. Meanwhile, it’s absolute necessary for us to take part in more outdoors activities.

查看答案和解析>>

科目：高中英語 來源： 題型：閱讀理解

3．I had dressed quite nicely for my first day as a student at  St．Anne's College of Further Education．In celebration of this new beginning，I had changed my unusual clothes to formal clothing．
Like many young people my age，I was under the impression that the best way to show your personality was by wearing the kind of clothing that my mother considered was not fit to be seen in public．But for my first day as a student I had made an effort to look what my mother called‘respectable'．
There were fifteen of us，sitting in the theatre hall，while the head of the drama department，Mr Wilson，gave us a warm welcoming speech．To my horror （恐懼），he then invited us to say why we had decided to do a drama course．I had no idea what I would say．The truth was that although I had a taste for unusual clothing，I was painfully shy．
My worry grew as it came closer to my turn．One by one，the new students excitedly explained their reasons．Then it was the turn of a girl who I hadn't really noticed until that moment because I was too busy thinking about what I would say．
‘My name's Tracy and I'm from Blackburn'，she said，and then added no further information．
Everyone smiled politely in silence but I was impressed at her bravery in saying almost nothing even under pressure （壓力）．I relaxed，knowing that you could get away with saying so little about yourself．It gave me confidence．
After Mr Wilson at long last let us out of the hall to go to lunch，I managed to find the courage to go up to Tracy．She looked very unfriendly．Taking a deep breath，I introduced myself．To my surprise，she looked up at me and gave me a very bright，sweet smile．That was twenty-seven years ago，and although we never did become famous stars，we're still best friends．

25．Why did the author change her appearance for her first day at college？C
A．She was under pressure from her mother．
B．She wanted to fit in with the other students．
C．She felt a need to dress properly．
D．She wanted to look like a great star．
26．According to Paragraph 3，the authorA．
A．was not as active as she might have seemed
B．hated the head of her department
C．was unsure of her reasons for wanting to do the course
D．was afraid that she would find the course too hard
27．The author was nervous becauseC．
A．she had never spoken in public
B．it was her turn to start first
C．she didn't know what to talk about
D．the other students were so excited
28．What does the underlined word"It"in Paragraph 5 refer to？D
A．Tracy also seemed extremely worried．
B．All attention was on Tracy．
C．The other students reacted politely to Tracy．
D．Tracy hadn't said very much．

查看答案和解析>>

科目：高中英語 來源： 題型：選擇題

10．______you are familiar with the author's ideas，try reading all the sections as quickly as you possible can．（　�。�
A．Now thatB．Ever sinceC．So thatD．In case

查看答案和解析>>

科目：高中英語 來源： 題型：填空題

10．Tom：Look!Someone（61）is celebrating（celebrate） his birthday．
Jimmy：There is no doubt that this is his 21st birthday．
Tom：Why？Do you know that guy？
Jimmy：No．Well，in America，21 is the age when you are allowed to drink．So，many guys celebrate it in bars．
Tom：That's interesting．But it would be really（62）expensive（expense），I suppose．
Jimmy：No．（63）Ifit is your birthday，you don't need to pay a cent．Just blow out the candles and open the gifts．That makes the birthday（64）aspecial day．It is your friends that will take care of everything．
Tom：Wow．That's（65）wonderful （wonder）．
Jimmy：What about in China？
Tom：At present，there is little difference between America and China．But we have traditional ways to celebrate（66）it．Mother will cook"long-lived"noodles．And（67）forold people，we will prepare birthday peaches．
Jimmy：Wow，birthday peaches!Real peaches？
Tom：No．They are made of wheat flour and they look just like real peaches．
Jimmy：Why peaches？Is there anything（68）amusing （amuse） behind it？
Tom：Yes．The Goddess is said to own some magical peach trees in heaven．If you eat peaches （69）growing（grow） on those trees，you will（70）neverdie．
Jimmy：Oh，I know that．

查看答案和解析>>

科目：高中英語 來源： 題型：閱讀理解

11．The practice of students endlessly copying letters and sentences from a blackboard is a thing of the past．With the coming of new technologies like computers and smartphone，writing by hand has become something of nostalgic （懷舊的）skill．However，while today's educators are using more and more technology in their teaching，many believe basic handwriting skills are still necessary for students to be successful---both in school and in life．
Virginia Berninger，professor of educational psychology at the University of Washington，says it's important to continue teaching handwriting and help children acquire the skill of writing by hand．
Berninger and her colleagues conducted a study that looked at the ability of students to complete various writing tasks---both on a computer and by hand．The study，published in 2009，found that when writing with a pen and paper，participants wrote longer essays and more complete sentences and had a faster word production rate．
In a more recent study，Berninger looked at what role spelling plays in a student's writing skills and found that how well children spell is tied to know well they can write．"Spelling makes some of the thinking parts of the brain active which helps us access our vocabulary，word meaning and concepts．It is allowing our written language to connect with ideas．"Berninger said．
Spelling helps students translate ideas into words in their mind first and then to transcribe（轉(zhuǎn)換）"those words in the mind written symbols on paper or keyboard and screen，"the study said．Seeing the words in the"mind's eye"helps children not only to turn their ideas into words，says Berninger，but also to spot（發(fā)現(xiàn)） spelling mistakes when they write the words down and to correct then over time．
"In our computer age，some people believe that we don't have to teach spelling because we have spell checks，"she said．"But until a child has a functional spelling ability of about a fifth grade level，they won't have the knowledge to choose the correct spelling among the options given by the computer．"
28．What makes writing by hand a thing of the past？B
A．The absence of blackboard in classroom      
B．The use of new technologies in teaching．
C．The lack of practice in handwriting．
D．The popular use of smartphones．
29．Berninger's study published in 2009A．
A．focused on the difference between writing by hand and on a computer．
B．indicated that students prefer to write with a pen and paper．
C．found that good essays are made up of long sentences．
D．discussed the importance of writing speed．
30．What does"mind's eye"in paragraph 5 mean？D
A．Window．B．Soul   C．Picture．D．Imagination．
31．What conclusion could be drawn from the passage？C
A．Computers can help people with their choice of words．
B．Spell checks can take the place of spelling teaching．
C．Handwriting still has a place in today's classrooms．
D．Functional spelling ability develops fast in the fifth grade．

查看答案和解析>>

同步練習(xí)冊答案