Different animals and pets have different colors. Have you ever wondered why they have their particular colors? Colors in them seem to be used mainly to ____1____ themselves.
Birds, especially seagulls ( 海鸥 ), are very ____2____ locusts ( 蝗虫 ), but birds cannot easily catch locusts because they change their colors together with the change of the color of crops. When crops are green, locusts look green. But when crops are ripe ( 成熟的 ), locusts take on exactly the same brown color as crops have. Some other pets with different colors from plants are ____3____ easily found and eaten by their enemies. So they have to hide themselves for lives during the day and ____4____ only at night.
If you study the animal life in any part of the world, you will find the main use of color is to keep themselves alive. Bears, wolves and other beasts move quietly through forests. They are usually invisible to eyes of hunters, because they have the color much ____5____ the barks ( 树皮 ) of trees.
An even stranger thing remains to be noticed. A kind of fish living in the sea can send out a kind of very black liquid when it faces danger. While the liquid is over, its enemies cannot find it, and it quickly swims away. ____6____ , it has existed ( 存在 ) up to now though it is not powerful at all.
1 ． A ． provide B ． prepare C ． prevent D ． protect
2 ． A ． proud of B ． fond of C ． pull of D ． tired of
3 ． A ． never B ． seldom C ． sometimes D ． usually
4 ． A ． disappear B ． appear C ． show D ． leave
5 ． A ． like B ． dislike C ． seem D ． unlike
6 ． A ． However B ． Instead C ． Therefore D ． But
1 ． D
2 ． B
3 ． D
4 ． B
5 ． A
6 ． C
【解析】
【导语】
本文主要介绍了动物身上颜色的作用。
1 ．
句意：它们身上的颜色似乎主要是用来保护自己的。
provide 提供； prepare 准备； prevent 预防； protect 保护。根据下文 “easily found and eaten by their enemies” 可知，动物身上的颜色是用来保护自己的，故选 D 。
2 ．
句意：鸟类，尤其是海鸥，非常喜欢吃蝗虫。
proud of 以 …… 为傲； fond of 喜欢； pull of…… 的拉动； tired of 疲惫。根据 “but birds cannot easily catch locusts” 可知，海鸥喜欢吃蝗虫，故选 B 。
3 ．
句意：其他一些与植物颜色不同的宠物通常很容易被敌人发现和吃掉。
never 从不； seldom 很少； sometimes 有时； usually 通常。根据 “Some other pets with different colors from plants are … easily found and eaten by their enemies” 可知，与植物颜色不同的宠物通常容易被宿敌发现，故选 D 。
4 ．
句意：所以它们不得不在白天躲藏起来，只在晚上出现。
disappear 消失； appear 出现； show 展示； leave 离开。根据 “So they have to hide themselves for lives during the day” 可知，白天躲起来，晚上出来活动，故选 B 。
5 ．
句意：因为它们的颜色很像树皮。
like 喜欢，像； dislike 不喜欢； seem 似乎； unlike 不像。根据 “They are usually invisible to eyes of hunters” 可知，因为身上皮毛的颜色很像树皮，所以能躲开猎人的眼睛，故选 A 。
6 ．
句意：因此，它一直存在到现在，虽然它并不强大。
However 然而； Instead 反而； Therefore 因此； But 但是。根据 “While the liquid is over, its enemies cannot find it, and it quickly swims away” 以及 “it has existed ( 存在 ) up to now though it is not powerful at all” 可知，因为可以放出液体让敌人看不见，因此它们才可以存活很久，故选 C 。