2. 外语
  3. Plastic bags are useful for holding many kinds of food,______their cleanness, toughness and low cost.

Plastic bags are useful for holding many kinds of food,______their cleanness, toughness and low cost.

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问题 Plastic bags are useful for holding many kinds of food,______their cleanness, toughness and low cost.
选项 A、by virtue of
B、in addition to
C、for the sake of
D、as opposed to
答案A
解析 各选项的意思是：by virtue of依靠，由于；in addition to除……之外；forthe sake of为了……；as opposed to与……相反，与……对比。根据句意，应选择A。
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