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单项选择题

Land is becoming desert because of lack of ______.

A．rain
B．people
C．wind
D．plants

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热门试题

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

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