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【单选题】

Which of the following combinations is correct?

A.
nuclear-expensive
B.
wind turbines-reliable
C.
gas-imported
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参考答案:
参考解析:
.
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举一反三

【单选题】The technicians needed to retrofit the old computers with new chips.

A.
put a new piece of equipment into a machine that did not have it when it was built
B.
replace new equipment with old equipment
C.
put old parts into a new machine