试题与答案

My sister is only two years old, and I h

题型:选择题

题目:

My sister is only two years old, and I have to _____ her on Sunday.

A. look for     B. look after     C. look like      D look at

答案:

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(1)酸雨的危害有:腐蚀建筑物,毁坏植物,使土壤酸化等.故填:雕像受到酸雨腐蚀;森林受到酸雨破坏.(2)400kg煤中含有的硫元素的质量为:400kg×1%=4kg,二氧化硫中硫元素的质量分数为:3232+16×2×100%=50...

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