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  3. As global warming continues to be major concern for the future of our planet, pe

As global warming continues to be major concern for the future of our planet, pe

游客2023-12-15  13
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.
选项
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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