先从总体中抽取一个初级单元的样本，再从抽中的单元中抽取一些基

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问题单项选择题

先从总体中抽取一个初级单元的样本，再从抽中的单元中抽取一些基本单元组成样本，这种抽样方法称做（）。

A.二阶抽样

B.分层抽样

C.二相抽样

D.整群抽样

答案

参考答案：A

完形填空

用括号内所给词的适当形式填空。

小题1:If someone doesn’t show good manners to others, he or she is （polite）.

小题2: (lucky), the sick boy had a successful operation at last.

小题3:It is silly of you (not forgive) others for their faults.

小题4: Listen! The music (sound) wonderful! I’ve never heard it before.

小题5: Yellow is the colour of (wise). Some people like to use it when they study for exams.

小题6:The old man (live) here since 1992.

小题7:You’d better make the (decide) as soon as possible.

小题8:While I ( travel) in Australia last summer, I saw lots of sheep.

小题9: Edison was one of the great (invent) in the world.

小题10:I am sure that the film is worth (see)

单项选择题配伍题

糖皮质激素抗炎作用机制是（）

A.稳定溶酶体膜

B.抑制DNA的合成

C.抑制抗体形成

D.抑制细菌

E.杀灭细菌