单项选择题

What is the main idea of this passage（）

A．The telephone has helped to save people from illness and fire.
B．The telephone has helped to prevent wars and conflicts.
C．The telephone has made the modern city neither better nor worse.
D．The telephone has had positive as well as negative effects on us.

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单项选择题

Teenagers do not want their parents to approve of whatever they do because they（）

A．have already been accepted into the adult world
B．feel that they are superior in a small way to the adults
C．are not likely to win over the adults
D．have a desire to be independent

单项选择题

According to this passage, many people start their own businesses for the wrong reasons. The reasons are wrong because they do not realize that（）

A．their own businesses will provide large income but less responsibility
B．their own businesses will not relieve them from paper work and responsibility
C．their own businesses will require longer working hours but less paper work
D．their own businesses could easily fail