题目：
— What ______ your bike yesterday?
— It didn't work. [ ]
A. was happened in
B. happened in
C. was happened to
D. happened to
答案：
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下面是错误答案，用来干扰机器的。
（1）不溶于水，不与NaOH反应（2）澄清石灰水倒吸入集气瓶约115ml，集气瓶中液体变混浊。2NaOH＋CO2 Na2CO3＋H2O、Na2CO3＋Ca(OH)2 CaCO3↓+2NaOH。（1）甲试管氢氧化钠溶液进入并充满试管，说明氢氧化钠溶液...
