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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单项选择题
Beijing is a pleasant place with convenient transportation and communication system.()

A. shocking
B. pleasing
C. boring
D. surprising
单项选择题
She was unwilling to go but she had no choice.()

A.unable
B. indecisive
C. ready
D. reluctant
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