单选题：Scientists are not sure why we need sleep．

题目内容：

Scientists are not sure why we need sleep． A．Right
B．Wrong
C．Not mentioned

参考答案：

答案解析：

During the experiment，Gardner slept for two hours every nigh

During the experiment，Gardner slept for two hours every night． A．Right B．Wrong C

分类：卫生类题型：单选题

In paragraph 2,"It won't be when..." means_________.A．A "it is possible when… "

分类：卫生类题型：单选题

The test produced disappointing results． A．unsatisfactory B．indirect C．similar D

分类：卫生类题型：单选题

The company recommended that a new petrol station be built here.A．A demanded B．B

分类：卫生类题型：单选题

Don't hazard your reputation by supporting his joint venture with the gay from L

分类：卫生类题型：单选题