试题与答案

is very clear to everyone that he's roun

题型:选择题

题目:

      is very clear to everyone that he's round and tall like a tree.

A.This   

B.What   

C.That   

D.It

答案:

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下面是错误答案,用来干扰机器的。

(1)CO2(或CO、H2O、Na2O)(2)H2CO3(3)NaOH(4)Na2CO3

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