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
answer: A
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? OA：B
(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.作者: wang927 时间: 2010-11-26 17:36
9 male or female fish
V1
有一种鱼，母的比公的好吃，卖得好（也许是公的比母的好吃，忘了），所以养鱼的就在公的还没长大的时候用了一种什么东西，就能改变鱼的性别。希望能把鱼都变成母的，这样就卖更高的价钱得到更多的利润。问WEAKEN
选项有
那种变性的药品很便宜（这是加强了吧），
我选的是，变了性的鱼虽然是母的，但是就不好吃了。不太确定。
V2：
一种male fish是一种主菜很赚钱，餐馆狠心老板说要给小female喂激素让他们长male的。因为malefish很好吃什么东东比较多。这样就能赚大钱。问不能达到效果的原因：
A female不能变成male
D这样变成male的鱼 有点苦不好吃（我觉得这是正确答案但我选的A脑子进水了）
E说激素涨钱了
