语法上看起来是代词it，但实际上这是一个形式主语，指代身后的从句that a United States citizen hold gold in the form of bullion or coins。

The advertisement states that every improvement in the quality of manufactured products leads to increased expectations among customers, yet that MegaCorp has a goal of meeting or exceeding its customers' expectations.

It follows that MegaCorp will continually be able to meet this goal only if it is possible for it to continue improving the quality of its products.

The hole forms when the temperature drops below –78°C during the Antarctic spring. If much of the area where the hole appears was significantly warmer than the previous year—perhaps above –78°C—there exists a reason other than a recovery in the ozone layer that explains the smaller size of this year's hole in the ozone. This would support the scientists' skepticism.

A. Although the stringency of government regulations could help explain increased research spending and the granting of fewer patents, it fails to explain why profits would increase in the long term.
B. Correct. This helps explain all three factors. It suggests that each company has had to boost its research spending, but with a narrowing of focus to produce mass-market drugs with enormous potential for profit. This narrowing of focus could explain why fewer drugs are being patented.

请问A选项是不是有以下两个错：①it指代不清；②claims后省略了that，从句当中from a one-page writing sample that it can assess没有主语，所以是个fragmen?

B. Correct. Suppose that the flies that did not avoid the odor when tested individually were more likely to avoid the odor when in groups. This may be simply because these flies were following the movements of the flies that were triggered. That is, the signal did not cause the other flies' reactions. Instead, the movements of the triggered flies did. It follows that this possibility must be ruled out in order for the hypothesis to be plausible, and this answer choice does precisely that.

To determine whether it is responsible to keep paying these fishers to catch northern snakehead, it is vital to understand whether the fishers' work up to this point has had any observable effect.

E. Determining whether there are other threats to the rare native fish species would tell us whether the plan, if successful, is sufficient to save the rare fish species. Still, it is not useful in determining whether that plan is likely to be successful.

（转 存档）这题我扒了国内国外很多解释，最后还是同意RON解释的。
RON觉得，“Heating-oil prices are expected to be higher this year than last”跟“Prices at the producer level are only 1.3 percent higher now than a year ago”，都是省略了（they were），省略了之后 aren't necessarily faulty，也就是省略不省略都可以接受。比较对象是两个时间段的价格，但不是 those of last year，因为要跟前面的句式保持平行，所以是they were。

overlook 后面不可以接宾从，只有overlook the fact that
ask, refuse, cause, force, condemn, admire, like/dislike, celebrate这些后面都不能直接接that，但可以用it 或者 the fact 作为媒介

两个削弱方向：1. 他因导致瓶子不容易辨认。2. 尽管label不一样，但是还是不容易辨认。削弱方向2就是选项D：因为顾客买酒的时候是凭借most obvious features，distinctive的外表（瓶子的颜色和形状）来辨认的，所以就算商标不一样，顾客还是会弄混。

三组平行修饰opinion……差中选优就是A。。。我比较好奇第三个平行前为什么不需要连词

exhibit应该跟animals主谓一致，has been expanded是跟a list of主谓一致。排除a b选项，c e选项中的either or平行结构不对，所以应该选择d。

D选项中的excited about应该与and 后面的predicted并列，但是predicted是谓语，无法并列，所以D选项错误。

忘了,+including不是伴随。。。

感觉这个题还有难度的。
ABC有代词指代不清的嫌疑，根据句意they指代the cathedrals of Middle Age, 但是这里也可能指代edifices；同样they are structures忽略掉修饰部分，这个主句部分语义不对；
E的问题在于they are的出现。这里其实不需要，因为这里是说这种大教堂作为社交中心和作为纯粹宗教建筑这种使用功能的程度相当。

简单题：
Visible equipment表达清晰，说明人容易意识到照明类电器的用电，如果按照ABC的表达，那么删除掉定于部分，意思就不清楚了。
E：when放在这里不合适，这里是要做两类电器的用电量，that指代the amount of energy

补充一点A，has been这里用法错误

A. 自己过度脑补排除了A

忽略了条件：n is also the square of an integer