单项选择题

The price of vegetables fluctuates according to the weather().

A. jumps
B. rises
C. falls
D. changes

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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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Beijing is a pleasant place with convenient transportation and communication system.()

A. shocking
B. pleasing
C. boring
D. surprising

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