单项选择题

The main idea of this passage is ______.

A．one type of people becomes happy.
B．one type of people becomes miserable.
C．the happy people enjoy all the cheerful things.
D．there are two types of people in the world.

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单项选择题

If such unhappy persons don't change their bad behavior, the author's solution to the problem is that ______.

A．people should avoid contact with them
B．people should criticize their misconduct
C．people should help them recognize the bad effects
D．people should show no respect and politeness to them

单项选择题

After the use of the laser beam, surgeons can perform operations which ______.

A．leave the patients with negative effects
B．can. treat only human eye disease
C．do little damage to the patients themselves
D．make the patients need a long time to recover