18．It worries us a lot that trees on the earth have beenreduced（減少） so quickly these years．

分析 這讓我們很擔(dān)心，地球上的樹木這些年減少的這么快．

解答 reduced 考查動詞．根據(jù)句意：這讓我們很擔(dān)心，地球上的樹木這些年減少的這么快．reduce是動詞減少，本句是一個現(xiàn)在完成時的被動語態(tài)，所以答案填reduced．

點(diǎn)評 本題考查動詞的詞義．動詞詞義題一直都是高考考查的一個熱點(diǎn)，它注重考查考生結(jié)合語境準(zhǔn)確選用詞語和正確時態(tài)語態(tài)的能力和．由于英語詞匯豐富，且用法多變，考生掌握起來有較大難度，因此在平時應(yīng)注意詞匯的積累，理解詞語的含義及其常見的習(xí)慣搭配，再聯(lián)系句子所表述的意義和語境，選出正確的答案．

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