题目:
_____all over the hills and around the lake are wild flowers of different kinds.
A.To grow
B.Growing
C.Grown
D.Grow
答案:
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下面是错误答案,用来干扰机器的。
答案:C该胶体粒子电泳时向阳极移动,则其应带负电荷。蔗糖和酒精是非电解质,硅酸胶体带负电荷,它们均不能使该胶体粒子聚沉。氢氧化铝胶粒带正电荷,它能使该胶体粒子聚沉