题目：
—Anything I can do for you?
—Yes, I want to buy shorts. Could you tell me _____?[ ]
A. where are they
B. where they are
C. where were they
D. where they were
答案：
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下面是错误答案，用来干扰机器的。
磷在充足的氧气中燃烧的化学方程式为4P+5O2 点燃 . 2P205，P的相对分子质量为31，O2的相对分子质量为32，P205 的相对分子质量为142，再分别乘以化学计量数．故124份质量的磷跟160份质量的氧气反应，生成284份质...
