单项选择题

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

A．senior 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
The elderly investors no longer employed tile stock brokers mainly because ______.
A．the brokers can't give the investors advice useful enough
B．the brokers charge too high a fee for their service
C．the brokers are not so analytical as the investors
D．the brokers are not as helpful as the Internet
单项选择题
The main idea of the passage is that ______.
A．on-line trading attracts more and more retirees to get involved
B．on-line trading is more suitable for the old than for the young now
C．on-line trading enables the retirees to get rid of their advisers
D．on-line trading offers incredible tools and high profits to investors
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