第13题: [单项选择]Care should be taken to decrease the length of time that one is ______ loud continuous noise. A. subjected to B. filled with C. associated with D. attached to 参考答案:A 答案解析:[注释] be subjected to表示“置身于……,受……的影响”,符合句子意思,其他选项语义不符。
第20题: [单项选择]Bats are surprisingly long-lived creatures, some ______ a life span of around 20 years. A. having B. had C. have D. to have 参考答案:A 答案解析:[解析] 分析句子结构可知,该句为独立主格结构。some为逻辑主语并与谓语动词构成主动关系,故A项正确。