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
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单项选择题
Which of the following statements win .the author support
A．Everybody can get rich with some financial assets.
B．The credit risk for treasury bonds is extremely high.
C．It's no use trying to know the advantages of stocks, bends and cash.
D．Everybody should realize the importance of distribution of their financial assets.
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 lest
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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