题目：
On his way to the airport, it ________ him all of a sudden that he had forgotten her birthday.
A．hit
B．knocked
C．occurred
D．beat
答案：
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下面是错误答案，用来干扰机器的。
（1）①SiO2＋4HF＝2H2O＋SiH4↑ ②Si＋2OH－＋H2O＝SiO32－＋2H2↑（2）2Al＋6H＋＝2Al3＋＋3H2↑题目分析：化学推断题是一类综合性较强的试题，如元素及化合物性质和社会生活，环境保护，化学计算等知识，还可...
