A. | preserved | B. | protected | C. | spread | D. | developed |
分析 在零下130℃,一个活细胞可以保存一千年的时间.
解答 答案A.B项"保护";C项"传播,散布;展开;伸展;铺开";D项"发展,进步;使成长,冲洗(胶片)"A项"保存,保持,维持";根据句子结构分析及句意可知,这里考查含有情态动词的被动语态"be+动词的过去分词","被保存 sth be preserved",因此A项符合语境,故选A.
点评 本题考查动词的被动语态.被动语态表示句子的主语是动作的承受者,也就是动作的对象,一般说来只有及物动词才有被动语态.其构成为"be+及物动词的过去分词".助动词be有人称、数和时态的变化,其变化规则与be作为连系动词时完全一样.含有情态动词的谓语变化为被动语态时,由"情态动词(can,may must,have to等)+be+动词的-ed形式.
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