46 Which of the following titles best expresses the main idea of this passage?
(A)Solar Energy: How It Works and Its Limitations.
(B)Solar Energy: Its Advantages and Developments.
(C)Solar Energy: Its Past and Current Developments.
(D)Solar Energy: Why It's Widely Used and Its Future.
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【題組】46 Which of the ...
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46 下列哪一個標題最能表達本文的中心思...
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