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【参考答案】

将percents改为percent。
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填空题将it改为they。

填空题Three 3

单项选择题A．entertain and advertiseB．educate and advertiseC．educate and entertainD．be informative and instructive

A．entertain and advertise
B．educate and advertise
C．educate and entertain
D．be informative and instructive

单项选择题A．positiveB．negativeC．optimisticD．pessimistic

A．positive
B．negative
C．optimistic
D．pessimistic

单项选择题A．one dayB．two daysC．one weekD．two weeks

A．one day
B．two days
C．one week
D．two weeks