单项选择题

A．She can do the job.
B．She could call a friend.
C．She’’s just switched off the light.
D．She’’s already replaced the shelf.
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单项选择题
An oil spill can pose a big problem to the environment.
A．Y
B．N
C．NG
单项选择题
The passage gives a general description of the benefits and potential problems of a hydrogen economy.
A．Y
B．N
C．NG
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