再来问两道，谢谢各位了~

fengchen318

15.The level of lead contamination （污染，污染物）in United States rivers declined between 1975 and 1985. Federal regulations requiring a drop in industrial discharges（排出） of lead went into effect in 1975, but the major cause of the decline was a 75 percent drop in the use of leaded gasoline between 1975 and 1985.
Which of the following, if true, best supports the claim that the major cause of the decline in the level of lead contamination in United States rives was the decline in the use of leaded gasoline?
(A) The level of lead contamination in United States rivers fell sharply in both 1975 and 1983.
(B) Most of the decline in industrial discharges of lead occurred before 1976, but the largest decline in the level of river contamination occurred between 1980 and 1985.
(C) Levels of lead contamination in rivers fell sharply in 1975-1976 and rose very slightly over the next nine years.
(D) Levels of lead contamination rose in those rivers where there was reduced river flow due to drought.（B）
(E) Although the use of leaded gasoline declined 75 percent between 1975 and 1985, 80 percent of the decline took place in 1985.
B有什么关系吗。。。想不通。。。我选E。。。

16.George Bernard Shaw wrote: “That any sane（明智的，心智健全的） nation, having observed that you could provide for the supply of bread by giving bakers a pecuniary（金钱上的） interest in baking for you, should go on to give a surgeon （外科医生）a pecuniary interest in cutting off your leg is enough to make one despair （失望，绝望）of political humanity.”
Shaw’s statement would best serve as an illustration in an argument criticizing which of the following?
(A) Dentists who perform unnecessary dental work in order to earn a profit
(B) Doctors who increase their profits by specializing only in diseases that affect a large percentage of the population
(C) Grocers who raise the price of food in order to increase their profit margins
(D) Oil companies that decrease the price of their oil in order to increase their market share（A）
(E) Bakers and surgeons who earn a profit by supplying other peoples’ basic needs
我选的D。。。答案是Ａ。。。为什么

fengchen318

顶一下~

fengchen318

cycyang

15 B
(B) Most of the decline in industrial discharges of lead occurred before 1976, but the largest decline in the level of river contamination occurred between 1980 and 1985.
76年之前工业排放铅已经很少，说明规定“regulations”1975年实施后最多是对75年的铅排放有较大影响。而最大幅度的污染减轻是在80-85年之间，这时工业排放已经趋于平稳，只有含铅汽油（the use of leaded gasoline ）使用量的减少才会带来对河水铅含量影响。显然，第一次变化没有第二次变化程度大，所以第二次变化的主因，即含铅汽油使用量的减少，才是河水含铅量下降的主因。支持了本题结论。
(E) Although the use of leaded gasoline declined 75 percent between 1975 and 1985, 80 percent of the decline took place in 1985.
这只是在说75-85年间含铅汽油使用量的下降幅度不均匀，主要集中在85年，并不影响使用量下降这个实施。和工业排放因素没有做比较，不能加强结论。

cycyang

16 A
(A) Dentists who perform unnecessary dental work in order to earn a profit
题干是在批判那些以唯利是图为目标的职业人。牙医为利润而做一些没有必要的治疗工作正是这种现象的体现。
(D) Oil companies that decrease the price of their oil in order to increase their market share
企业采用降价的手段来提高市场份额是正常的竞争手段，和唯利是图没有必然联系。

ossan

15  根据题干应该有一种正选是排除他因（也就是the decline in industrial discharges of lead ）的感觉
然后看一下选项很快锁定B。
E是无关项哦，反复讨论 leaded gasoline 来迷惑你

gaoyuanwg

牛牛们解释一下吧！我也被这两道题困扰了好久

gaoyuanwg

牛牛们解释一下吧！我也被这两道题困扰好久了。谢谢！