单项选择题

People generally believe that on-line trading is a practice of __________.

A．seasoned investors
B．people in a specific province
C．relatively young people
D．groups made up of 20 or 30 traders
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单项选择题
Compared with other age groups, why should older investors be more prudent about their investment
A．They often turn a deaf ear to others' advice.
B．They tend to gamble away their retirement pensions.
C．This is a world for the young people.
D．They do not have as many sources of income.
单项选择题
Which of the following is NOT MENTIONED in the passage
A．The lost cost and high profits are the two major advantages of on-line trading.
B．On-line trading is threatened by invasions.
C．Old investors contribute a lot to on-line trading.
D．Full-service brokers provide investors with helpful information.
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