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问题 单项选择题

流砂发生的土层为：

A.颗粒级配均匀的饱和砂土

B.颗粒级配不均匀的饱和砂土

C.颗粒级配均匀的不饱和砂土

D.颗粒级配不均匀的不饱和砂土

答案

参考答案：A

解析：流砂常发生在颗粒级配均匀的饱和砂土地基中。

解答题

已知函数f（x）=（x2+ax-2a2+3a）ex（x∈R），若a∈R，求函数f（x）的单调区间与极值．
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选择题

_______, the idea of having to work under a woman defeated him.[ ]

A. Wanting the job very much                

B. Although wanting the job very much

C. Though he wanted the job very much        

D. He wanted the job badly
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