单项选择题

A．It served as a fertilizer for crops.
B．It formed a new mountain.
C．It stabilized air temperatures.
D．It destroyed various insect pests.
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单项选择题
A．It has been put off.B．It has been cancelled.C．It will be held in a different place.D．It will be rescheduled to attract more participants.
A．It has been put off.
B．It has been cancelled.
C．It will be held in a different place.
D．It will be rescheduled to attract more participants.
单项选择题
The word meltdown in Paragraph 1, sentence 1 is closest in analogy to _______.
A．the radioactive core of a nuclear Dower
B．a controlled nuclear reaction
C．nuclear energy slips out of control and ends up in a full-blown disaster
D．the breakdown of the cooling system
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