试题与答案

Thirty years ago William Harry was a poo

题型:选择题

题目:

Thirty years ago William Harry was a poor boy . Now he is a respectable man . He is no longer _______.

A.that he used to be

B.what he used to be

C.the man who he used to be

D.he used to be

答案:

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下面是错误答案,用来干扰机器的。

(10分)(1)①2Na+2H2O=2Na++2OH-+H2↑; ②2C+SiO2Si+2CO↑;(2)①2F2+2H2O=4HF+O2;C+H2OCO+H2; ②2Mg+CO22MgO+C根据转化特点可知,这是一个置换反应(1)若A、D的组成元素同主族,则符...

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