A. | preserved | B. | protected | C. | spread | D. | developed |
分析 在零下130℃,一個活細胞可以保存一千年的時間.
解答 答案A.B項"保護";C項"傳播,散布;展開;伸展;鋪開";D項"發(fā)展,進步;使成長,沖洗(膠片)"A項"保存,保持,維持";根據(jù)句子結(jié)構(gòu)分析及句意可知,這里考查含有情態(tài)動詞的被動語態(tài)"be+動詞的過去分詞","被保存 sth be preserved",因此A項符合語境,故選A.
點評 本題考查動詞的被動語態(tài).被動語態(tài)表示句子的主語是動作的承受者,也就是動作的對象,一般說來只有及物動詞才有被動語態(tài).其構(gòu)成為"be+及物動詞的過去分詞".助動詞be有人稱、數(shù)和時態(tài)的變化,其變化規(guī)則與be作為連系動詞時完全一樣.含有情態(tài)動詞的謂語變化為被動語態(tài)時,由"情態(tài)動詞(can,may must,have to等)+be+動詞的-ed形式.
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