XDF-44,45

mingming8152

Blood banks will shortly start to screen all donors for NANB hepatitis. Although the new screening test are estimated to disquality 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.

44.the argument above depends on which of the following assumptions?

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

b) donors carrying NSNB hepatitis do not, in a large percentage of cases, develop the disease themselves at any point.

45.which of the following inferences about the consequences of instituting the new tests is best supported by the passage above?

a) the incidence of new cases of NANB hepatitis is likely to go up by 10 percent

d) the blood suppliers available from blood bands are likely to go down.

我对题目的理解：血站很快会用新技术检查献血者是否有病。虽然新技术可以将检验带病的血的比例提高至5%，但是仍然有2/3的有病献血者查不出来。因此捐献的血液中仍然有10%有病。因为有2/3的有病的人查不出来，所以整体的血液中有10%不合格。

44问得出结论的假设。即有10%不合格血的假设。必须这些人的血要在血库里，即查不出有病。

a)有NANB这个病的人没有其他病，如果有其他病用常规方法就查出来了，他们就不能献血了

d)有NANB这个病的人没有治病。（如果他们的病治好了，那么献的血不就没病了吗？）

45问由新检验技术导致的结果可以推论出什么？仍然还有有病的人查不出来，血库里还有有病的血

a)血库中的血有病的概率为10%（这个不对是因为它只是题目的重新叙述，而不是inference？）

b)血库中能用的血减少

谢谢啦

mingming8152

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