地西泮具有（）A.中枢性肌肉松弛作用 B.反射性地兴奋呼吸的作用 C.外周性肌肉松弛

用 while, meanwhile, during填空

1.      _the winter vacation, I came to know how to make coffee.

2. He came to visit me         I was out.

3. He often does his homework before a computer;        he listens to MP3.

Our class teacher is still on ______ holiday, so our monitor will be in ______ charge of the meeting today.

A．/; /

B．the; the

C．a; /

D．the; a

What time is it?[ ]

A. It's 7 o'clock.         

B. It's 7.                   

C. At 7:00.                               

D. On 7:00.

国务院是在什么时候将三八妇女节列入全国年节及纪念日？（）

A.1949.10.1

B.1949.12.20

C.1949.12.23

描述变异程度的指标是（）。

A.总体均数

B.标准差

C.样本均数

D.几何均数

E.中位数