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【单选题】
As described at the beginning of the passage, people used to think that air pollution______.A.
had damaging effects on health
B.
existed merely in urban and industrial areas
C.
affected the entire eastern half of the United States
D.
caused widespread damage in the countryside
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【简答题】当剪应力不超过材料的（ ）极限时，剪应力 与剪应变 成正比例关系
【单选题】The real estate the company_______was sold at a higher price than the original one.
A.
purchased
B.
was purchased
C.
to purchase
D.
purchasing
【简答题】A．By sharing the profit made by the company. B．By selling the stock at a higher price. C．By working hard. D．By studying about the stock market.
【简答题】当剪应力不超过材料的 时,剪应力与剪应变成正比例关系,这就是 。
【简答题】当剪应力不超过材料的剪切（）极限时，剪应变与剪应力成正比。
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