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【单选题】
An industry ischaracterized by scale economies, and exists in two countries. Should these two countries engage in trade such that the combined market is supplied by one country's industry, thenA.
consumers in both countries would suffer higher prices and fewer varieties.
B.
consumers in the importing country would suffer higher prices and fewer varieties.
C.
consumers in the exporting country would suffer higher prices and fewer varieties.
D.
consumers in both countries would enjoy fewer varieties available but lower prices.
E.
None of the above
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【简答题】若不定积分 ，则被积函数f(x)______．
【简答题】若不定积分∫f(x)dx=x2＋c，则不定积分∫xf(1－x2)dx=( )． (A)－2(1－x2)2＋c (B)2(1－x2)2＋c (C) (D)若不定积分∫f(x)dx=x 2 +c，则不定积分∫xf(1-x 2 )dx=( )．