一个总体含有100个个体，以简单随机抽样方式从该总体中抽取一个容量为5的样本，则

My name _____ Betty. [ ]

A. am      

B. is      

C. be       

D. are

It       for the whole week. The city will be flooded if it       soon.

A．rained; won’t stop

B．has been raining; doesn’t stop

C．has rained; won’t stop

D．rained; doesn’t stop

_______ , the car stopped all at once.[ ]

A. Seeing a boy lying on the ground      

B. The minute the driver saw a boy seated on the road

C. On seeing a boy sitting on the ground  

D. The driver saw a boy standing on the road

简述关于艺术起源的五大学说。

水文地质条件复杂型和极复杂型矿井的涌水量观测每月观测（）次，受降水影响的矿井，雨季观测次数应适当增加。

A.不少于3

B.不少于5次

C.不少于2次

D.1-3次