--Growing population resulted in growing rubbish.
--There is possibility that rubbish ________the major threat to human beings.
A．becomesB．is becomingC．becameD．would become
B
    
試題分析:考查動(dòng)詞時(shí)態(tài)。根據(jù)語(yǔ)境可知此處是對(duì)未來(lái)的預(yù)測(cè)，所以用現(xiàn)在進(jìn)行時(shí)態(tài)表示將來(lái)。句意：--逐漸增多的人口造成了越來(lái)越多的垃圾。---有可能垃圾會(huì)成為人類最大的威脅。
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