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【单选题】
干灰化法测定化妆品中砷时，在样品中加入助灰化剂。它们的作用是A.
硝酸镁可以加速消化过程
B.
氧化镁可以加速消化过程
C.
氧化镁可以对砷起固定作用，防止砷的挥发损失
D.
硝酸镁能防止砷的挥发损失
E.
硝酸镁和氧化镁的作用一样
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【单选题】It seems that the cattle on the side of the dykes _________ the only living creatures here.
A.
was
B.
were
【简答题】B. Organization Identify what each of the underlined pronouns refers to. After a long struggle, the battle was won. Dr. Kelly requested the business office to pass the final bill to him for approval. ...
【单选题】It seems the cattle on the side of the dykes __ the only living creatures in these desolate surroundings.
A.
was
B.
were
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