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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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
The retired crafts designer Carol Potts sounds to be __________.
A．very analytical
B．quite shrewd
C．kind of seasoned
D．rather confident
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