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
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
Which of the following best summarizes the main idea of the passage
A．Hypochondria happens to everybody sooner or later.
B．We needn't worry about hypochondria since it is not dangerous at all.
C．Hypochondria originates from too much knowledge of medicine.
D．Not only individuals but also the healthcare system might be disturbed by unnecessary terrors.
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