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【单选题】
从含有N个元素的总体中抽取n个元素作为样本,使得总体中的每一个元素都有相同的机会被抽中,这样的抽样方式称为( )。A.
简单随机抽样
B.
分层抽样
C.
系统抽样
D.
整群抽样
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举一反三
【单选题】The student often ______ on the playground after class.
A.
do sports
B.
does sports
C.
did sports
【单选题】According to the passage, what do student researchers often learn when they discuss their work in class?
A.
Other students rarely have objective comments about it.
B.
Other students do not believe the researchers did the work themselves.
C.
Some students feel that the conclusions are too obvious.
D.
Some students do not understand the meaning of the researchers' questions.
【单选题】Identify the topic sentence from the following paragraph. The student often came late to class without his materials. He did not always concentrate on what the teacher was saying or write down the hom...
A.
The student often came late to class without his materials.
B.
He did not always concentrate on what the teacher was saying or write down the homework that he had to do.
C.
He did not study long or effectively enough for his vocabulary and grammar tests.
D.
Furthermore, he did not ask for help if there was something that he did not understand.
E.
It is no surprise therefore that he failed the course and was asked to leave the school.
【单选题】The student often asks his father for advice____he gets into___.
A.
Every time;troubles
B.
Before;troubles
C.
Every time;trouble
D.
Before;trouble
【简答题】“How often do you go to the library?” the teacher asked the student. →The teacher asked the student _____ _____ _____ _____ to the library.
【单选题】The student is often heard _______ English songs.
A.
sing
B.
to sing
C.
sang
D.
singing
【单选题】According to the passage, what do student researchers often learn when they discuss their work in class?
A.
Other students rarely have objective comments about it.
B.
Other students do not believe the researchers did the work.
C.
Some students feel that the conclusions are too obvious.
D.
Some students do not understand the meaning of the researchers' questions.
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