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5.引狼入园
某公园自从引入了wolf，另一x动物的存活高了，原因是wolf吃elks，恰恰elks是feed on x 动物，strengthen题，我选A.引入wolf后，elks数量decrease dramatically.

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4卡车GWD变体  本题无法确定选项！
A：triple-trailers3节卡车太危险，又重又不好制动,总之很危险,所以应该禁止在高速上开，3个州都禁止
卡车的维护者：在这三个州中三节卡车事故低于(not greater than)普通的卡车,所以不应该禁止
问B的错  我好像选的"not greater than"不等于少于......  

考古  狗主人说：内容有相似，但问法绝对不一样，大家注意变体
GWD-28-Q17
In the nation of Partoria, large trucks currently account for 6 percent of miles driven on Partoria’s roads but are involved in 12 percent of all highway fatalities. The very largest trucks – those with three trailers – had less than a third of the accident rate of single- and double-trailer trucks. Clearly, therefore, one way for Partoria to reduce highway deaths would be to require shippers to increase their use of triple-trailer trucks.
Which of the following, if true, most seriously weakens the argument?
A): Partorian trucking companies have so far used triple-trailer trucks on lightly traveled sections of major highways only.
B): No matter what changes Partoria makes in the regulation of trucking, it will have to keep some smaller roads off-limits to all large trucks.
C): Very few fatal collisions involving trucks in Partoria are collisions between two trucks.
D): In Partoria, the safety record of the trucking industry as a whole has improved slightly over the past ten years.
E): In Partoria, the maximum legal payload of a triple-trailer truck is less than three times the maximum legal payload of the largest of the single-trailer trucks

3. Opponents of allowing triple-trailer trucks to use the national highway system are wrong in claiming that these trucks are more dangerous than other commercial vehicles. In the western part of the country, in areas where triple-trailers are now permitted on some highways, for these vehicles the rate of road accident fatalities per mile of travel is lower than the national rate for other types of commercial vehicles. Clearly, triple-trailers are safer than other commercial vehicles.
Which one of the following, if true, most substantially weakens the argument?
(A) It takes two smaller semitrailers to haul as much weight as a single triple-trailer can.
(B) Highways in the sparsely populated West are much less heavily traveled and consequently are far safer than highways in the national system as a whole.
(C) Opponents of the triple-trailers also once opposed the shorter twin-trailers, which are now common on the nation’s highways.
(D) In areas where the triple-trailers are permitted, drivers need a special license to operate them.
(E) For triple-trailers the rate of road accident fatalities per mile of travel was higher last year than in the two previous years.

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3.fish and settlers
V1  
曾经great lake鱼很多时周围住的settlers很多，鱼少了住在湖边的人就少了。问flaw，湖被污染了

考古：
V1
某个种族靠打鱼为生，所以应该只住在渔产丰富的河的沿岸，可是发现有些人也住在现在渔产不怎么丰富的河边，说明鱼的分布后来变了。问weaken。

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2.机场运客轨道往东还是往西修    要自己有无登机（boarding），无法确定选项
V1一城市修建通往机场的rail，以缓解交通堵塞。有两个机场 W and E，但是rail只能缓解一个。因为60%的乘客去E 所以要rail通往E，问evaluate
E per fly的乘客数对比。 虽然E的总的多，但不一定乘客会聚在一起。交通堵塞也许不严重

V2因为去机场的路堵塞，政府考虑修新的地铁还是什么的，这个城市有2个机场，west and south, 政府只能修建其中一个路线。West 登机乘客占60%，所以建议修west的。问需要知道什么？
A需要知道两个机场乘客中只是转机（transit，change）的乘客的比例