P： 被大学录取的人多了-> C: 拥有本科学位进入就业市场的人也会比以前更多, weaken
choice (b) attacks this connection -- if students are taking longer to graduate from college, then the increased enrollment doesn't necessarily mean that there will be any more graduates! it's just a symptom of the fact that students are staying in school for longer.
part of/a part of：
都表示部分，part of侧重不肯分割的部分及占比较大的部分，a part of侧重指较小部分 Right：Sleep is part of a person's daily activity cycle. Right：Our world is but a small part of the cosmos.
因果推理
P：afford a better view of the celebrities & do not stay as long as diners seated at standard-height tables
C：its profits would increase
若想削弱，就是反驳推理文段中的结论
因果推理
P：Once an airline successfully implements this method, any attempt to recoup the earlier losses by charging high fares on that route for an extended period would only provide competitors with a better opportunity to undercut the airline's fares.
C：this method of eliminating competition cannot be profitable in the long run
若问削弱，就是要反驳推理文段中的结论“this method cannot be profitable”
果因推理
P：in 1960 some polio vaccine was contaminated with the virus
C： this vaccine was the source of the virus found in mesotheliomas decades later
若想加强（取非），要么提到出现这个结果的另一个原因，要么讨论前提和结论中两件事儿的关系。
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P：因为孩子很少从流感发展严重的并发症。-> C: 给孩子用新型的鼻喷雾不会对公众健康有益。assumption
choice d, 成年人很少从得流感的孩子那里传染得病。取非以后削弱结论。