問題詳情
35. The greenhouse effect occurs _______ heat radiated from the Sun.
(A) when does the Earth’s atmosphere trap
(B) does the Earth’s atmosphere trap
(C) when the Earth’s atmosphere traps
(D) the Earth’s atmosphere traps
參考答案
答案：C
難度：簡單0.879121
統計：A(8),B(5),C(240),D(20),E(0)
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