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单项选择题

A．It included many everyday words.
B．It presented good sentences to show the uses of each word.
C．It defined easy words as well as hard ones.
D．It was nothing more than a list of difficult words.
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单项选择题A．They are a threat to most forms of living creatures.B．They cannot be controlled effectively.C．They will be wiped out with male mosquitoes one day from the earth.D．They are a necessary element in the balance of nature.

A．They are a threat to most forms of living creatures.
B．They cannot be controlled effectively.
C．They will be wiped out with male mosquitoes one day from the earth.
D．They are a necessary element in the balance of nature.

单项选择题A．It cost much more than its worth.B．It should be brought up-to-date.C．It calls for immediate repairs.D．It can still be used for a long time.

A．It cost much more than its worth.
B．It should be brought up-to-date.
C．It calls for immediate repairs.
D．It can still be used for a long time.