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【单选题】

Why did the resistance of insects to man -made insecticides develop so rapidly

A.
Because fanners use less insecticides now.
B.
Because farmers have been using insecticides for many years.
C.
Because insects are using the mechanisms against poisons produced by plants to deal with insecticides.
D.
Because insects have been eating plants for many million years.
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参考解析:
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【单选题】常用的不确定性分析方法不包括( )。

A.
概率分析法
B.
敏感性分析法
C.
财务费用法
D.
盈亏平衡分析法

【单选题】下列不属于材料费用的是( )。

A.
材料原价
B.
材料运杂费
C.
材料采购保管费
D.
材料二次搬运费

【单选题】What do we learn from the conversation about Smith().

A.
Smith will attend a funeral.
B.
Smith has died.
C.
Smith’s life is unusual.