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单项选择题


A．There will be a lot of rain.
B．Rain is very unlikely.
C．It’s already raining.
D．She’s not sure.
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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

单项选择题What is causing the sixth great extinction according to the polling

A．Five extinction waves in the history.
B．The Permian and the Cretaceous event.
C．An errant asteroid and some volcanoes.
D．The human beings.