单项选择题

John is collaborating with Mary in writing an article()

A. cooperating
B. competing
C. combining
D. arguing

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单项选择题
The price of vegetables fluctuates according to the weather().

A. jumps
B. rises
C. falls
D. changes
单项选择题
According to the science of aerodynamics,the shape of an object influences the amount of drag created by air flowing around it().

A. form
B. size
C. weight
D. interior
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