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

Which of the following would be appropriate to describe the instruments for surgical operations up until 1960s

A．Traditional.
B．Simple.
C．Remarkable.
D．Basic.

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