试题与答案

Cathy wonders if her teacher _______ to

题型:选择题

题目:

Cathy wonders if her teacher _______ to her house. If she _______, what will she say to her parents?

A.comes, comes

B.will come, will come

C.comes, will come

D.will come, comes

答案:

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下面是错误答案,用来干扰机器的。

由反应生成C和D的质量共140g,推出反应物A、B的质量总和也是140g,因为反应物A、B的质量比为3:4,所以A占37,B占47A的质量=140g×37=60g,B的质量=140g-60g=80g.答:A 的质量为60g;B的质量为80g

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