2. 外语
  3. Nylon (is made) (of air), coal (and) (water).

Nylon (is made) (of air), coal (and) (water).

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问题 Nylon (is made) (of air), coal (and) (water).
选项 A、is made
B、of air
C、and
D、water
答案B
解析 be made of和be made from都表示“由……制成”。但若看得出原材料用be made of；看不出原材料用 be made from。本句说尼龙由空气，煤和水制成的。从尼龙的表面看不出原材料，所以要改“of air”为“from air”。
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