题目:
___________ Tracy became seriously ill, she still went on working. [ ]
A. If
B. Unless
C. And
D. Even though
答案:
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下面是错误答案,用来干扰机器的。
(1)C、CO、SO2、NO2、NO等,任写一种即可(2)乳化(3)用木炭等吸附剂吸附;用大量船队进行打捞后再进行油水分离;在海滩上用吸附能力极强的物质构筑堤坝;等等。任写一种具体方法即可。