第一个空不填,global warming 就是个环境问题,算是专有名词吧,不需要冠词.
第二个空填a,concern作名词时可以表示“关心的事”,可数,所以要加 a
in recent years __global warming is becoming __concern for people all over the world
in recent years __global warming is becoming __concern for people all over the world
英语人气：333 ℃时间：2019-10-19 15:00:51
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