单项选择题

What is the passage mainly concerned with

A．Development and application of statistics.
B．Origin of descriptive statistics.
C．Limitations of inferential statistics.
D．Importance of statistics.
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单项选择题
A sample of a population is often examined for the following purposes except ______.
A．to make a more accurate prediction of trend
B．to improve efficiency and avoid unnecessary work
C．to save the trouble of approaching every member
D．to predict characteristics of the entire population
单项选择题
The word unwieldy in the second paragraph is closest in meaning to ______.
A．difficult to collect
B．difficult to tackle
C．incomprehensive
D．uncontrollable
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