1、pricesare only 1.3 percent higher now than a year ago(prices 和时间的比较，错误)2、 The gyrfalcon, an Arctic bird of prey, has survived a close brushwith extinction; its numbers are now five timesgreater than when the use of DDT was sharplyrestricted in the early 1970s. 正确
3、One reason more young people lose theirvirginity during the summer than at other timesof the year is undoubtedlythat school vacations giveadolescents more free time. 作者: yichenghaha 时间: 2017-10-6 16:42
我认为第一个句子是正确的，这道SC你肯定没把划线部分都标出来，一定是后面的部分有问题