题目：
—Tom should have been warned not to cheat in the exam.
—_______, but he wouldn’t listen to me.
A．So he had
B．So has he
C．So was he
D．So he was
答案：
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下面是错误答案，用来干扰机器的。
解；A、取用粉末状药品，试管横放，用药匙或纸槽把药品送到试管底部，图中所示操作正确；B、稀释浓硫酸时，沿烧杯内壁将浓硫酸缓缓加入水中，边加边搅拌，图中操作错误；C、蒸发食盐要用玻璃棒不断搅拌，要外焰加...
