题目内容：

选择：fish are sold ____while cloth is sold ____
A.by the weights;by meters B.in weight;in meters
C.in weight;by the meter D.by weight;by the meter

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D
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乖へ 下午 14:25:08
1. In the market, vegetables are sold by _______ kilogram, I mean, by _______ weight.
A. the; 不填 B.不填; 不填 C. the; the D.不填；the
选A.介词by表示“以…计”时,若后接单数可数名词,其前要用定冠词,如：by the week 按周,按星期 / by the ton 按吨 / by the yard 按码 / by the meter 按米；若后接抽象名词,则通常不用冠词,如：by volume 按体积 / by weight 按重量.
我还和朋友一起讨论过.呵呵.
冠词真的有点难!