C 选项的iit 指代不明确，因为 有可能指代 the course of action 或者是incipient trouble 他们两者都是句子中间的宾语 所以都有可能成为 it的指代
A选项中 make it possible to do sth 如果是在描述一个大众可以发出的动作的时候那么就可以不用说明谁是这个动作的发出者，但是如果是描述的是特殊群众的动作，那么必须表明这个主体是谁。
当being作为modifier 即描述某物的特征的的时候可以排除，而在这里只是动名词做主语可以不用排除。

枚举推理

完成时标志 since for weeks

应该是复数，看those

削弱的是Salcor的做法。
C 如果不鼓励R公司员工检查，他们后来回去G公司，都是属于Salcor的范围内。

前面讲的非盈利医院会比盈利医院投入更多，但产出是一样的。然后谈到这里会导致对流水线服务的不警惕。-例子 作者只是单纯指出一个问题，并不是想要给予建议

A 第一部分给出了信息，如果没这个信息，那么论证将不足。

注意括号内的内容

C 选项中的have discovered 有问题，in 1932 只是一个过去的时间点，应该用过去时间，而不是现在完成时

AC选项中是想清楚到底是谁向女顾客推销新的陌生的技术。是指的这些产品展示者而不是这些公司和生产者

C 选项的 it指代 有问题，数的应该是很多种语言，而不仅仅只是指代一种语言，所以错误。其次try doing 指的是 轻松的去尝试做某事，通常不需要有结果， try to do 则表示 总体感觉很吃力，但是通常要有结果

2，3，4段都在评估amphibian灭绝的可能性，不一定是因为环境恶化，还有其他可能，因此A的灭绝不能成为环境恶化的证据

错选B 合格工人的短缺不意味着要雇佣不合格的工人。 文章前文说通过训练让其达到合格。 所以B错。
C正确。 As the wages of those workers are bid up, labor costs, and thus prices, rise. Those指代前面的合格工人。

Except题一定要找到定位 一般答案就在一句话里！ 通过5个选项里的关键词 找到定位！

第二段最后： Workers can be encouraged to move where there are jobs, to reeducate or retrain themselves, or to retire. In addition, other factors affecting structural unemployment, such as capital movement, can be controlled.

2.E is using "easily" to modify "be bought directly." The meaning is that it is easy for people to buy directly. If we move "easily," it is now just modifying "bought." This would mean that what we can do directly is specifically to "easily buy" stocks. It oddly/awkwardly implies that "easy buying" can be direct, but "non-easy buying" cannot. Basically, it violates the order in which we should sensibly apply modifiers.

1."evidence to suggest" and "evidence that suggests" are both acceptable in this sort of context. neither is a basis for elimination.normally you would see "evidence that suggests"
however, they've used "evidence to suggest..." here, in order to avoid writing evidence THAT suggests THAT xxx. not because it's wrong -- just because it's ugly.

that跳跃修饰 the extremes.

Though the extreme rapidity of quantum tunneling was noted as early as 1932, not until 1955 was it hypothesized—by Wigner and Eisenbud—that tunneling particles sometimes travel faster than light.

persist 存留