专升本考试

【单选题】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
网考网参考答案：A
网考网解析：
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