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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单项选择题
Compared with other age groups, why should older 'investors be more cautious about their in- vestment
A．They often turn a deaf ear to others' advice.
B．They tend to be more gambling in nature.
C．They are not so quick-witted as the young.
D．They do not have as many sources of income.
单项选择题
What does the author most probably think about hypochondria
A．The author considers that hypochondria is an incurable disease.
B．The author thinks that the consequences of hypochondria might be disastrous.
C．The author suggests that the patients who have hypochondria should set their hearts at rest.
D．The author sympathizes with the patients who suffer from hypochondria.
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