极限为( )
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A a protector B a judge C a critic D a guide
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A Offer aid to build cleaner power plants. B Raise public awareness of conservation. C Press for further scientific research. D Take some legislative measures.
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5 .The phrase “reneging on”(para.1) is closest in meaning to __________.
A condemning B reaffirming C dishonoring D securing
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A obtain protection from Vermont regulators B seek favor from the federal legislature C acquire an extension of its business license D get permission to purchase a power plant.
8 .对于3阶矩阵A，如果r（A）=3，则r（A*）=（）。
A 0 B 1 C 2 D 3
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10 .设某一批电灯泡的寿命（以小时计）近似服从N(160,202)分布，随机选取4个，那么其中没有一个寿命小于180小时的概率为（ ）。
A （0.1587）4 B （0.1687）4 C （0.1787）4 D （0.1487）4
