1 ____widely used in the chemical industey ,sodium carbonate is prinicipally consumed by the industey.A) DespiteB) Though2 Helium is not flammable and, next to hydrogen, is____A)kmown the lightest gasB)the lightest gas known
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１．选Ｂdespite不管，尽管．是介词,后加名词,或动名词，一般不接过去分词的形式 in despite of 固定搭配，不管，尽管eg。Despite the bad weather,they had a good time。though是连词,虽然,尽管，后接句子．widely used in the chemical industey 在这里是省略了主语 it is/sodium carbonate is ,因为主句和从句是同一主语，所以从句的主语可以省去eg。Though it was cold,they had a good time。 though (Tom was)young,Tom was good at doing this work。这句话的意思是，虽然碳酸钠被广泛应用于化学也，但它主要在工业中使用２．选Ｂknown是过去分词做后置定语，也可以看做省去了which is,被知道Helium is not flammable and, next to hydrogen, is the lightest gas which/that is known。如选Ａ 必须加kmown as the lightest gasknow as。。。固定搭配，称为，被认为。
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B, Despite is prep Though (it is) widedly XXX. Hehe, the (it is) is omitted.B, 可以把A改成 IS KNOWN AS THE XXX, A will be right.
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第一题逗号之前是过去分词做状语所以选副词despite，though是连词，应该连接句子。第二题known是过去分词做后置定语，完整的说法：the lightest gas which is known
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b 从句子意思讲是虽然。。。但是。应该是Bb is sth. known 是配合。如果用is known 要加as is know as sth.
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第一题主要区分词义,despite是介词,所以其后要接名词或代词而though后接句子.第二题选Bknown是后置定语.