As we all know, apples are sold by ________ weight, and socks are sold by ________ dozen．A.the; aB./; aC./; theD.the; the
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C解析by time, by weight, by height这些时间、重量、高度，意思很广的词无冠词；by the hour, by the kilogram, by the meter这些时、公斤、米，是time, weight, height的具体化就有冠词the; by the dozen是固定短语“大量，很多”。故本题选择C项。