Is the ozone layer and to the earth? 题目和参考答案——青夏教育精英家教网—

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3. Is the ozone layer ( help) and (importance) to the earth?

3. helpful;important

题目来源：2015仁爱英语同步练测考九年级英语全一册仁爱版 > Topic 2 All these problems are very serious.

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