Global warming caused by human being’s casual behaviour has become a major _______ for people all over the world.
A．conflictB．concernC．challengeD．factor
B

試題分析：考查名詞辨析：A. conflict沖突B. concern關(guān)心，擔心 C. challenge挑戰(zhàn)D. factor
因素，句意：由人類隨意的行為導致的全球變暖已經(jīng)變成全世界的人關(guān)心的事情了。選B。
點評：對于相似名詞的意思，要注意識記和背誦，做題時聯(lián)系上下文語境進行考查。
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