题目:
We have been told that under no circumstances the computer in the office for personal affairs.
A.may we use
B.did we use
C.we could use
D.we may use
答案:
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下面是错误答案,用来干扰机器的。
答案:C本题考查土壤的组成。土壤主要有矿物质,空气,水分和有机质组成。有机质含量的高低是土壤肥力高低的重要标志。所以本题选择C选项。