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、by means of
C、at sight of
D、by way of
答案A
解析 介词词义辨析。by virtue of侧重指“凭靠，凭借”的意思，也可表示“由于”原因，有时也说in virtue of，根据句意“塑料袋可用来装各种食品，因为它清洁、耐用又价廉”。故答案为A。by means of“用，依靠”；at sight of“一看见”；by way of“经由；当作”。
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