单项选择题

A．Joe bought Fred’s car.
B．The man is joking.
C．Fred’s car is not good.
D．The man wants Jack’s car.
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单项选择题
The mention of the extinction of the US auto industry is used to show
A．Extinction is very important to all the human beings
B．All the species lived in the past have died off today
C．Evolution will inevitably cause species to disappear
D．The loss of a few species among millions affects nothing
单项选择题
According to the passage, authorship is important when ______.
A．practical or impractical suggestions of the authors are considered
B．appointments and promotions of the authors are involved
C．evaluators need to review the publication of the authors
D．the publication of the authors has become much-cited
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