大全-2-19 and 大全-11-16

Blood banks will shortly start to screen all donors for NANB hepatitis. Although the new screening tests are estimated to disqualify up to 5 percent of all prospective blood donors, they will still miss two-thirds of donors carrying NANB hepatitis. Therefore, about 10 percent of actual donors will still supply NANB-contaminated blood.

19. The argument above depends on which of the following assumptions?

(A) Donors carrying NANB hepatitis do not, in a large percentage of cases, carry other infections for which reliable screening tests are routinely performed.

(B) Donors carrying NANB hepatitis do not, in a large percentage of cases, develop the disease themselves at any point.

(C) The estimate of the number of donors who would be disqualified by tests for NANB hepatitis is an underestimate.

(D) The incidence of NANB hepatitis is lower among the potential blood donors than it is in the population at large.

(E) The donors who will still supply NANB-contaminated blood will donate blood at the average frequency for all donors.

The answer is A. I didn't understand how to induce this answer.

16.George Bernard Shaw wrote:" That any sane nation, having observed that you could provide for the supply of bread by giving bakers a pecuniary interest in baking for you, should go on to give a surgeon a pecuniary interest in cutting off your leg is enough to make one despair 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 increaase their profit margines.

(D) Oil companies that decrease the price of their oil in order to increase their market share.

(E) Bakers and surgeons who earn a profit by supplying other peoples' basic needs.

Blood banks will shortly start to screen all donors for NANB hepatitis. Although the new screening tests are estimated to disqualify up to 5 percent of all prospective blood donors, they will still miss two-thirds of donors carrying NANB hepatitis. Therefore, about 10 percent of actual donors will still supply NANB-contaminated blood.

19. The argument above depends on which of the following assumptions?

 (A) Donors carrying NANB hepatitis do not, in a large percentage of cases, carry other infections for which reliable screening tests are routinely performed.

（E）The donors who will still supply NANB-contaminated blood will donate blood at the average frequency for all donors.

题中说:Although the new screening tests are estimated to disqualify up to 5 percent of all prospective blood donors, they will still miss two-thirds of donors carrying NANB hepatitis.那就说明被杳出有NANB hepatitis的只点了1/3,即总共有15%prospective blood donors 有NANB.5%被发现，还有10%漏网。题中结论要成立必须是：所有漏网的prospective blood donors都有可能去 donate blood.A，提供了这种可能性。

这题理解起来比较费事,因为:George Bernard Shaw他语法太差.得猜.

George Bernard Shaw 从BAKER因为好处为你烤面包,外科大夫因为好处为你剁脚谈到一个人的政治政治操守DESPAIR问题. 总这是在说一句话:为钱而失去良心.(就像我们经理一样) 

George Bernard Shaw 的话可以用来批判 A: 牙科大夫为了钱会在你的牙上乱搞. 可恶..

George Bernard Shaw的话逻辑不是很明确,估计他GMAT成绩也不是很好...