（B） A crow(乌鸦) is about twenty inches(英寸) long and black all

（B） A crow(乌鸦) is about twenty inches(英寸) long and black all over. Crows are dirty birds be
（B）
A crow(乌鸦) is about twenty inches(英寸) long and black all over. Crows are dirty birds because they live on 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, and in the evening you can see them in large numbers flying back to their nests(巢) 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(轮流) like human beings(人). It is easy to tell(判断) from crow’s sound if 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 some time later it dies too.
( ) 31. Crows “live on bad food” means “ _____________ “.
A. Crows eat old bad food. B. Old bad food is crows’ nests.
C. Crows make their nests on old bad food. D. Crows sleep on old bad food.
( ) 32. Crows are more useful to us because they ________________.
A. are clean birds B. can move away waste food
C. can make our streets clean D. aren’t dirty
( ) 33. Crows always look for food _______________.
A. in the evening B. all day C. in the morning D. at night
( ) 34. People can’t hear crow talk __________.
A. together B. by turns C. noisily D. quietly
( ) 35. If a pair of crows loves each other, ________
A. they will not live together. B. neither of them can live alone happily.
C. they will die D. one of them will die