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 本题答案是A。A项的意思是：by virtue of依靠，由于。其他各选项的意思是：in addition to除……之外。for the sake of为了。as opposed to与……相反，与……相对比。根据句意，应选择A。
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