高等教育 / 新发展英语综合教程（二）
In order to support this argument, the writer gives the example that _ _ _ _ _ _ _ .
A、a machine using solar energy efficiently has already been developed
B、the sun is our final source of power
C、man uses only a tiny part of the sun''s energy
D、the part of the sun''s energy we use is used indirectly
A、a machine using solar energy efficiently has already been developed
B、the sun is our final source of power
C、man uses only a tiny part of the sun''s energy
D、the part of the sun''s energy we use is used indirectly
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