单项选择题

According to Peter Ward's research, _________.

A．90% of animals and plants went extinct 250 million years ago
B．dinosaurs died off as a result of meteor impacts
C．the "Great Dying" has much to do with volcanic activity
D．global warming played a minor part in the "Great Dying"

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热门试题

单项选择题

According to the passage, scientific journals _________.

A．have lost their prominent position in the research community
B．will still play their due role in publishing research papers
C．will fail to keep scientific knowledge up-to-date
D．will become obsolete with the development of "scholarly skywriting"

单项选择题

Scholarly skywriting has all the following advantages except _________.

A．avoidance of copyright trouble
B．swift transmission of thought
C．utilization of the wisdom of other individuals
D．easy updating of manuscripts