单项选择题

A．displacement of people
B．transit stoppage
C．serious injuries
D．airport delays
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单项选择题
The principal subject discussed in this passage is ______.
A．the bleak future for the oceans
B．the resources in the oceans
C．the environmental damage to the oceans
D．the climatic changes caused by ocean currents
单项选择题
The stars described in the passage are______.
A．shells that are put in a launcher
B．heavenly bodies in the sky
C．brilliant colors produced by fireworks
D．compressed chemical powder
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