42. According to the passage, which of the following is a drawback of fossil fuels?
(A) They are not renewable.
(B) Their resources are hard to explore.
(C) They cannot satisfy the domestic energy need.
(D) The process of their refining consumes much energy.
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統計: A(200), B(30), C(108), D(47), E(0) #2407142
統計: A(200), B(30), C(108), D(47), E(0) #2407142