单项选择题

A．Because he has a test that night.
B．Because he plans to go home for the weekend.
C．Because he has not studied at all during the semester.
D．Because he is helping his friend.
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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.
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.
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.
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