问题 单项选择题

有一批灯泡共1000箱,每箱200个,现随机抽取20箱并检查这些箱中的全部灯泡,这种抽样方式属于()。

A.纯随机抽样

B.类型抽样

C.整群抽样

D.等距抽样

答案

参考答案:C

解析:

整群抽样是将总体先分为若干群,然后按随机原则,成群地抽取样本单位,对抽中的群内所有单位都进行调查的一种抽样组织方式。题中将所要调查的总体“一批灯泡”分成了1000箱,然后随机抽取了20箱进行检查,然后对这20箱中的全部灯泡进行调查,这种抽样方式属于整群抽样。

阅读理解

Watch a good teacher, and you will see that he does not sit still before his class: he stands the whole time he is teaching; he walks about, using his arms, hands and fingers to help him in his explanations, and his face to express feelings. Listen to him, and you will notice the loudness, the quality and the musical note of his voice always change according to what he is talking about.

The fact that a good teacher has some of the gifts(天赋) of a good actor doesn’t mean that he will indeed be able to act well on the stage, for there are very important differences between the teacher’s work and the actor’s. The actor has to speak words which he has learnt by heart; he has to repeat exactly the same words each time he plays a certain part, even his movements and the ways in which he uses his voice are usually fixed beforehand(预先). What he has to do is to make all these carefully learnt words and actions seem natural on the stage.

A good teacher works in quite a different way. His audience take an active part in his play: they ask and answer questions, they obey orders, and if they don’t understand something, they say so. The teacher therefore has to meet the needs of his audience, which is in his class. He cannot learn his part by heart, but must invent it as he goes along.

I have known many teachers who were fine actors in class but were unable to take part in a stage-play because they could not keep strictly to what another had written. 

小题1:The word “audience” in the third paragraph means ________.

A.students

B.people who watch a play

C.people who are not on the stage

D.people who listen to something小题2:Students in a good teacher’s class are always ________.

A.active

B.quiet

C.noisy

D.sad小题3: In what way is a teacher’s work different from an actor’s?

A.The teacher must learn everything by heart.

B.He knows how to control his voice better than an actor.

C.He has to deal with unexpected(未预料到)situations.

D.He has to use more facial expression.小题4:From the passage, we can infer(推断) ________________.

A.Teachers have to learn by heart what they are going to say in class.

B.A teacher cannot decide beforehand what exactly he is going to say in class.

C.A teacher must speak louder than an actor.

D.A teacher must have a better memory than an actor.

单项选择题