(1) s =34, f = 27
34+27-x = 49
x = 12

不要不仔细看选项...感觉好像对就直接选了...有的时候它会故意把比较的方向搞反来误导你
E.black bear的活动地的地形比sloth bear更复杂=》那就说明sloth更应该能把娃放下来啊！！人家black bear的地形比你复杂都能把娃放下来

这道题moose‘s 和it不应该作为绝对排除点。官方态度似乎有所变化，详见 problem 805 of the 2018 Official Guide. 曼哈顿确认Our strategy guide is out of date on this point, but will be updated shortly. problem805中acai berry’s以it指代。

undermine的 暗中破坏
原文说量子物质在被实验观察到之前就被破坏；
E选项：量子物质存在的形式不依赖于何种实验，削弱原文。

反对一个argument，反对breed tiger的argument。 就是支持养虎的evidence

Indian tigers—a subspecies well represented in both zoos and the wild—and that zoos should focus their tiger management efforts on preserving subspecies whose existence is threatened,
argue说动物园应该努力保护濒危的物种，言外之意就是indian tiger不濒危

为什么C小于9

只要知道主语是force

ac them不符合语意 排除de转换格式”，“复制”，以及“不费力置换及无损音质”在逻辑上并列

However, during the 1960's real interest rates were often higher when the national savings surplus was large. 原文不是说实利率higher吗，为什么选B“remain low”……

抓住目的是什么！

方案 。目标reduce injuries
手段 monitor....in the classroom 注意限定词。

可是这个题一旦没有注意到前面的小点 ...就很有可能做错并且陷进死胡同...考试还是不要太纠结这种题了

高straying rate =》local adaptation被稀释
高straying rate =》lower fitness
gap：local adaptation被稀释 =》lower fitness
所以没有被稀释的adaptation对salmon是有好处的，是higher fitness的

果因。解释为什么吃wild berries 而不吃insects了。

The author states in the second paragraph that what is problematic about high straying rates is that adaptations of the local population may be diluted. If there were no benefit to local adaptations, then their dilution would not be a problem.

没注意到题中的three percent sales tax 和Three percent of current retail sales区别。
B选项销量会增加，税就会增加

mayor：double the area for crab nesting
birdwatcher:螃蟹密度会下降，影响bird
B选项说明螃蟹繁殖很快，削弱条件。

E Again, the comparison in the prompt is between competitive swimmers vs. those who do other competitive athletes. If all the people with "latent asthma" develop full-blown asthma when they start doing strenuous athletic activity, why would it show up only for swimmers and not for all other kinds of athletes. It's not as if swimming is the only kind of strenuous activity out there. This is irrelevant.

C选项的and链接两个并列独立的句子，但是原文是有因果关系的