单项选择题

Which of the following statements can best describe the telephone in the U. S

A．It's very inexpensive.
B．It saves a lot of trouble.
C．It's very convenient.
D．A ,B and C
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单项选择题
Scientists are trying to find a link between pollution and ______.
A．intelligence levels
B．antisocial behavior
C．birth defects
D．divorce percentage
单项选择题
In author's opinion, ______.
A．without computers, there would be no modern science
B．computers are more intelligent than human beings
C．computers will replace everything in the future
D．computers never make mistakes
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