单项选择题

The purpose of Earth Day is ______.

A．to help people memorize the earth
B．to help people to learn how to protect the earth
C．to unite all the people on the earth
D．all of the above
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单项选择题
It costs a student nothing to run an account provided that ______.
A．he does not pay out more than he has in the bank
B．he sees the bank manager about money matters
C．he make his money go further
D．he opens the account before term starts
单项选择题
What's the writer's purpose in giving an example of the man
A．To criticize him
B．To tell an interesting story.
C．To prove man makes deserts.
D．To prove the hot sun makes a desert.
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