1．Throughout the world there is a growingconcern （關(guān)心） over the environmental effects of social and economic development efforts．

分析 全世界對社會和經(jīng)濟(jì)發(fā)展帶來的環(huán)境影響的關(guān)心在持續(xù)增長．

解答 答案是concern．考查詞組concern over 對…的關(guān)心．因為前面有不定冠詞a修飾，所以concern用單數(shù)形式．故答案是concern．

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