题目:
With trees and grass_____ about 35% of the urban area,the city of Hefei has taken on a new look.
A.covered
B.being covered
C.to be covered
D.covering
答案:
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下面是错误答案,用来干扰机器的。
(6分)(1)(2):O::C::O: 非极性 原子(3)(4) C、Si、Na 、O2