单项选择题

What is the main idea of this passage

A．It states the principles of time.
B．It explains why time flies and how to slow it down.
C．It describes various views about time.
D．It shows the different ideas of physicists and psychologists on time.

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单项选择题

Why do teenagers tend to have strange clothes and hairstyles

A．Because they have a strong desire to be leaders in style and taste.
B．Because they want to show their existence by creating a culture of their own.
C．Because they have no other way to enjoy themselves better.
D．Because they want to make their parents angry.

单项选择题

Teenagers don' t want their parents to approve of whatever they do because （）.

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