6．The crow （乌鸦）is an ordinary（普通的） bird．It is about twenty inches（英寸） long and black all over．Crows are dirty birds because they live on old bad food．Crows eat a lot of waste food．In this way they are more useful to us than any birds．They clean up the dirty things in our streets．Crows are always hungry．They look for food all day long，and in the evening you can see them in large numbers flying back to their nests（窝） in the trees．They sleep there at night．
Crows are much noisier than other birds．Very often a large number of crows will get together on one house and talk．Sometimes they talk together，and sometimes they do it by turns like human beings（人类）．It is easy to tell from（区别） crows'sounds whether they are pleased or angry．Perhaps crows talk a lot because they are friendly birds．A pair of crows will live together all their lives，and if one of them dies，the other one becomes very sad and quiet for the rest of its life and sometimes it dies，too．
59．Why are crows dirty？B
A．They are black all over the body．
B．They like to eat dirty food．
C．They usually talk．
D．They don't have baths．
60．Why are crows more useful to us than any birds？D
A．They are usually noisy．
B．They are usually dirty．
C．They are flying in large numbers．
D．They eat a lot of waste food．
61．You can tell from crows'soundsB．
A．whether they are hungry or full
B．whether they are pleased or hungry
C．whether they are ill or healthy
D．whether they are living or dead．
分析 短文讲了乌鸦是一种普通的鸟，对它进行了介绍，解释了为什么说乌鸦是很脏的鸟，人们是如何听出乌鸦的喜怒等．
解答 答案：59．B 细节理解题．根据第一段第一行句子Crows are dirty birds because they live on old bad food．Crows eat a lot of waste food．乌鸦很脏因为它们靠又旧又脏的食物生存．乌鸦吃很多废弃的食物．可知它们喜欢吃脏的食物．故选B．
60．D 细节理解题．根据第一段第一、二行句子Crows eat a lot of waste food．In this way they are more useful to us than any birds．乌鸦吃很多废弃的食物．在这种情况下它们比其他的鸟更要有用．可知乌鸦吃很多废弃的食物，故选D．
61．B 细节理解题．根据第二段第二行句子It is easy to tell from （区别） crows'sounds whether they are pleased or angry．通过乌鸦的声音很容易辨别它们是否友好．可知通过乌鸦的声音很容易辨别它们是否友好．故选B．
点评 在通读全文的基础上，根据全文大意，展开逻辑思维，瞻前顾后，认真观察选项，仔细推敲，确定最佳答案．
