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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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 author of the passage points out that______.
A．keeping cash is the only way to avoid risks
B．the longer you own a stock, the more you lost
C．the high rate of' profit and high rate of risk coexist in stocks
D．the best way to accumulate wealth is by investing in stocks
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