Scientists think that most animals can’t see colous. The world is black and white to them. To find out if the dogs could see colours, scientists gave dogs food evey time they played a certain piece of music. The dog got ready to eat only when they heard this piece of music. They did not get ready to eat when they heard other piece of music.

Then the scientists gave the dogs food every time they showed them a certain colour. The dog got ready to eat when they saw this colour .The colours were all the same to them.

Colours are not all the same to the monkeys, however, for example, if we put food in a red box and do this every day, a monkey will always go to the red box to get the food. If we then put food in a blue box, the monkey won’t go to it.

(　 )16.All colours are the same to_______.

　　　 A.all animals　 B.scientists　 C.monkeys D.dogs

(　 )17.Monkeys know that red and blue are _______.

A.not the same　 B.the same C.colours　 D.food

(　 )18.The scientists give the dogs food every time they______.

A.saw the colour red　　　 B.went to a box of food

C.saw the colour blue　　　 D.played certain music

(　 )19.Dogs are different from monkeys because_______.

A.dogs can’t see any colours and monkeys can

B.dogs can’t see more colours than monkeys

C.monkeys can’t see any colours and dogs can

D.monkeys can’t see red and blue

(　 )20.Some ______ wants to find out if dogs could see colours.

A.animals　 B.doctors　 C.scientists　 D.monkeys

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科目：初中英語 來源： 題型：054

完形填空：

　Isaac Newton was 　1　  great English scientist, 　2　　　when he was thinking hard about his work, he often forgot 　3　　　 things.

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科目：初中英語 來源： 題型：054

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科目：初中英語 來源：英語教研室 題型：054

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