题目内容

随机抽样的类型有（）。

A. 简单随机抽样
B. 分层随机抽样
C. 分群随机抽样
D. 判断抽样
E. 任意抽样

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抽样调查的优点有（）。

A. 工作量小
B. 调查费用低
C. 时间短
D. 推论总体无误差
E. 调查费用高

After learning the prefix un-, suffix -ant and -ify, now try to fill in the blanks with the words in the bracket. Change the form where necessary.1. Despite being________(class) as a meat-eater, the panda has a diet that is overwhelmingly vegetarian.

2. They have developed computerized systems which will greatly _______ (assistant) all library users so that they will not need the help of others.

3. Changes have been made to the construction requirements in this city in order to make the buildings and highways more_________(resist) to earthquakes.