土地利用总体规划的主要目标是( )。A．合理安排土地使用的方式 B．依据国民经济和社

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(人类). 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.

小题1: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.小题2: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小题3:Crows always look for food _________.

A．in the evening

B．all day

C．in the morning

D．at night小题4:People can’t hear crow talk __________.

A．together

B．by turns

C．noisily

D．quietly小题5: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

目前磁共振成像使用的放射性核素不包括（）

A.A

B.B

C.C

D.D

E.E

中国古代宫殿外的陈设主要有（）。

A.华表

B.翁仲

C.日晷

D.嘉量

E.门海

储钱罐里有30枚1元和5角的硬币，共值22元，两种硬币各有多少枚？

人类肿瘤形成的原因有多种，目前哪一种为最佳学说（）

A.病毒致癌学说

B.化学致癌学说

C.物理射线致癌学说

D.多基因癌变，多阶段形成学说

E.癌变二阶段学说