As global warming continues to be major concern for the future of our planet, people are starting to turn to green living practi

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问题 As global warming continues to be major concern for the future of our planet, people are starting to turn to green living practices to help save it for future generations.

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答案∧major—a

解析 concern是可数名词,地球的温室效应只是人们的主要忧虑之一,应当用不定冠词。
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