单项选择题

A．Three groups of learners.
B．The importance of business English.
C．English for specific purposes.
D．Features of English for different purposes.
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单项选择题
We are warned that__________.
A．the renewable energy source will be less and less
B．the non-renewable energy will be more and more
C．there will be no energy source
D．heat energy will be permanent
填空题
A．forB．byC．withD．in
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