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21: A new hair-growing drug is being sold for three times the price, per milligram, as the drug’s maker charges for another product with the same active ingredient. - as
- than
- that
- of what
- at which
38: The market for recycled commodities like aluminum and other metals remain strong despite economic changes in the recycling industry. - commodities like aluminum and other metals remain
- commodities like those of aluminum and other metals are remaining
- commodities such as aluminum and other metals remains
- commodities, such as aluminum and other metals, remain
- commodities, like the commodities of aluminum and other metals, remains
这题我觉得答案D错了 选C吧？
[此贴子已经被作者于2007-11-21 0:14:27编辑过] | 
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发表于 2007-11-21 00:14:00
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