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

What does the author want to express with the example of Aristotle and Mohammed

A．Some lands are unable to produce famous philosophers or religious leaders.
B．Famous people were with strong cultural and times characteristics.
C．Cultural offspring's influence transcended their own cultures.
D．One can be so famous as to be popular in other cultures.

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.