第一段arge stretches of salmon habitat have been eliminated by human activity: .........The 【numerical effect】 is obvious: there are 【fewer】 salmon in degraded regions than in pristine ones
细节题,“ since the process provides a source of novel genes and a mechanism by which a location can be repopulates should the fish there disappear ” 的rephrase
should the stream recover=if the stream should recover虚拟语气
Clearly, using this test, doctors can largely avoid unnecessary removals of the appendix without, however, performing any fewer necessary ones than before, since ______.意思是:用这个检测,医生能够大量的避免对appendix不必要的移除,然而却不会比之前减少任何必要的移除。
因此,误诊的2%是增加unnecessary removal,而不是减少necessary removal。
文中只有一处出现了1997年之前24年间GDP在增长这句话,“One point these journalists overlooked is that in 1997, as in the twenty-four years immediately preceding it, the real GDP per capita grew nearly one-half percent a year more slowly than it had on average between 1873 and 1973. ”就说了24年间的比1873-1973年间的more slowly,slowly的原因没有介绍,后面说的都是1997年与1873-1973年的对比了,没有再提过这24年。
仔细看B