单选题
The power produced by the waves, tide and wind ______.
A、
is not as consistent as it should be
B、
is generally less in winter than in summer
C、
is never likely to be very great
D、
is consistent
【正确答案】
A
【答案解析】
细节题。根据文章首句中的“variable sources”，A选项与之意思相当。
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