单项选择题

A．Do extra work if necessary.
B．Change the spark plugs only.
C．Clean the spark plugs only.
D．Charge her more than ￡ 10 if necessary.
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单项选择题
A．He’s taking a break from studying.B．He has already finished studying,C．He was assigned to watch a program by his professor.D．He’s finding out some information for a friend.
A．He’s taking a break from studying.
B．He has already finished studying,
C．He was assigned to watch a program by his professor.
D．He’s finding out some information for a friend.
单项选择题
A．Children reared under average conditions possess average intelligence.B．Lack of opportunity prevents the growth of intelligence.C．An individual’s intelligence is determined chiefly by his environment.D．Changes of environment produce changes in the brain structure.
A．Children reared under average conditions possess average intelligence.
B．Lack of opportunity prevents the growth of intelligence.
C．An individual’s intelligence is determined chiefly by his environment.
D．Changes of environment produce changes in the brain structure.
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