第6题: [单项选择]There ought to be less anxiety over the perceived risk of mountain climbing than_______in the public mind today. A. exists B. exist C. existing D. to exist 参考答案:A 答案解析:本题译文:人们现在对爬山的风险性的疑虑变少了。此句中than是关系代词,相当于引导了一个定语从句;由于前部分的主语是anxiety,因此从句的主语也是anxiety,所以exist用单数形式。