单项选择题

A．They were influenced by his background in engineering.
B．They were very expensive to take.
C．They were among the first taken under such condition.
D．Most of them were of poor quality.
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单项选择题
A．She lost a lot of weight in two years.B．She stopped exercising two years ago.C．She had a unique way of staying healthy.D．She was never persistent in anything she did.
A．She lost a lot of weight in two years.
B．She stopped exercising two years ago.
C．She had a unique way of staying healthy.
D．She was never persistent in anything she did.
单项选择题
According to the author, the distinction between violent acts and non-violent ones in sports is ______.
A．impossible to make
B．not very clear in any circumstances
C．too obvious to escape observation
D．not very difficult to make if enough attention is paid to
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