单项选择题

Why can't doctors convince the sufferers that there is nothing wrong

A．Because the doctors can't cure the minor diseases.
B．Because the doctors don't assure them of that.
C．Because the sufferers are deaf and cannot hear what the doctors say.
D．Because lack of absolute guarantee makes the patients doubtful.
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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.
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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