With an appropriate unit noun: Part of the lake has been polluted. You can see the water is covered with a_______of oil.

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问题 With an appropriate unit noun:
Part of the lake has been polluted. You can see the water is covered with a_______of oil.

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答案film

解析 a film of意为“一薄层”;这里表示水面上覆盖着一层油。答案为film。
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