请教GWD-30-38

frances77

  GWD-30-Q38

The ancient Nubians inhabited an area in which typhus occurred, yet surprisingly few of their skeletons show the usual evidence of this disease.  The skeletons do show deposits of tetracycline, an antibiotic produced by a bacterium common in Nubian soil.  This bacterium can flourish on the dried grain used for making two staples of the Nubian diet, beer and bread.  Thus, tetracycline in their food probably explains the low incidence of typhus among ancient Nubians.

 

Which of the following is an assumption on which the argument relies?

 

A.        The tetracycline deposits did not form after the bodies were buried.

B.        The diseases other than typhus to which the ancient Nubians were exposed would not be affected by tetracycline.

C.        Typhus is generally fatal.

D.       Nubian grain became contaminated with tetracycline-producing bacteria prior to being harvested.

E.        Bread and beer were the only foods eaten by the ancient Nubians which could have contained tetracycline.

 

此题答案为A(B),可是我怎么觉得5个没个好的呢，请各位指教阿~~~~

（此题与GWD-18-30很相似，但是那题的选项很清楚的，可以参考下）

zijing4546

如果这种含抗生素的菌类(tetracycline),是在尸体下葬后(入土掩后)产生的话,那就说明它不是Nubians不得typhus的原因了. 这个是A要说的.
我对E项非常的confused......
请教高人把这道题详细的讲解一下.

frances77

ding

phoenixfr

哎，本来打了一大篇解释的，结果一不小心就全没了。

文章的论证逻辑是，食物里含有此抗生素，而人体内也有该抗生素（因为skeleton里有），所以该抗生素对typhus有用。

A就是填补skeleton里有和体内有的gap。所以A对。

E说只有此二中食物中有该抗生素，这个是无关的。即使是其他的食物中也有此抗生素也不影响该推理。所以E错。

frances77

yeah~ I totally get it now.

thank you so much~~~

Sacramento_CA

我怎么觉得A是排他因呢

yuching730

ANS: A

想请教各位大大们这题A取非不就支持T解释了低的伤寒发生率怎么会weaken结论咧??

yuching730

UP

[此贴子已经被作者于2007-11-25 4:21:36编辑过]

eileenmu木

假设题中出现极端词如E中的only特别需要留意，很多时候是以排除它因的假象作为干扰选项

pharmacystar

A，同意4楼

这个题关键要看出来那个词是抗生素的意思