Question

6．Different animals or pests（有害物） have their special colors？They use their special colors to protect（保护） themselves．
Some birds like eating locusts（蝗虫）．But birds cannot easily catch them．Why？It is because locusts change（改变） their colors together with the change of the colors of crops（庄稼）．When crops are green，locusts look green．But as the harvest time comes，locusts change to the same brown color as crops have．Some other pests with different colors from plants are easily found and eaten by others．So they have to hide themselves for lives and appear only at night．
If you study the animal life，you'll find the main use of coloring is protecting themselves．Bears，lions and other animals move quietly through forests．They cannot be seen by hunters（猎人）．This is because they have the colors much like the tree．
Have you ever noticed （注意）an even stranger act？A kind of fish in the sea can send out a kind of very black liquid（液体） when it faces danger．While the liquid spread over，the enemies（敌人） cannot find it．And it immediately swims away．So it has lived up to now though it isn't strong at all．

Answer the questions according to the passage．
76．Why can't some birds easily catch locusts？It is because locusts change（改变）their colors together with the change of the colors of crops
77．Some pets have different colors from plants．How can they keep out of danger？They have to hide themselves for lives and appear only at night
78．Why can't hunters see bears？Because they have thecolors much like the tree
79．What can the kind of fish sent out when it faces danger？It can send out a kind of very black liquid（液体）when it faces danger
80．Can birds easily find locusts？No，they can't．

Answer 1

分析 这篇文章讲述了不同的动物和害虫都会有着和环境相似的颜色，这些颜色主要是用来保护它们自己不伤害．

解答 76．It is because locusts change（改变） their colors together with the change of the colors of crops．细节理解题．根据It is because locusts change（改变） their colors together with the change of the colors of crops（庄稼）．可知因为蝗虫随着庄稼颜色的改变而改变它们的颜色，所以鸟不容易捉住他们，故答案为：It is because locusts change（改变） their colors together with the change of the colors of crops．
77．They have to hide themselves for lives and appear only at night．细节理解题．根据So they have to hide themselves for lives and appear only at night．可知一些动物不得不在白天隐藏自己，只在晚上出现，故答案为：They have to hide themselves for lives and appear only at night．
78．Because they have the colors much like the tree．细节理解题．根据They cannot be seen by hunters（猎人）．This is because they have the colors much like the tree．可知猎人看不见猎物是因为它们的颜色很像树，故答案为：Because they have the colors much like the tree．
79．It can send out a kind of very black liquid（液体） when it faces danger．细节理解题．根据A kind of fish in the sea can send out a kind of very black liquid（液体） when it faces danger．可知一种海里的鱼当面临危险的时候会放出一种黑色的液体故答案为：It can send out a kind of very black liquid（液体） when it faces danger．
80．No，they can't．细节理解题．根据But birds cannot easily catch them可知鸟不容易捉住他们，故答案为：No，they can't．

点评 做题的时候要看清要求，要在理解好文意的基础上，与题目有机的结合，从文章中找到相关细节性的句子从而得出符合文章内容的正确答案．