[問題]GWD 30-Q38

[bonus]

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.

Answer: A

[bonus]

A取非
tetracycline deposits form after the bodies were buried
如果是後來產生的話，文章說的推理不對了。

如果這些東西是人死後產生的，那麼之前的那些「土裡的細菌－食物－進入人體－不得病」這樣的推理騎不是失去了推理的意義。

[CherrieLi]

不好意思, 我想請問一下D選項, 雖然我知道A是對的, 但我覺得D好像也行得通

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

因為文中提到, The skeletons do show deposits of tetracycline, an antibiotic produced by a bacterium common in Nubian soil.

也就是說這種 antibiotic (tetracycline) 是需要 soil 來幫助形成的, 所以必須在收割前就跟這種tetracycline-producing bacteria有染, 才會有後續結論.
相反的, 如果在收割前沒有感染這種tetracycline-producing bacteria, 收割後就離開土壤了, 就不會感染tetracycline-producing bacteria, 所以也不會導出後面的結論

請問我這樣的解釋是否有不合理的地方呢?

[dibert8]

不一定是由這個途徑,只要 tetracycline 存在就可以了.

[ilovecushi]

A取非
tetracycline deposits form after the bodies were buried
如果是後來產生的話，文章說的推理不對了。

如果這些東西是人死後產生的，那麼之前的那些「土裡的細菌－食物－進入人體－不得病」這樣的推理騎不是失去了推理的意義。

'
why the answer is not E?

i think E is much related to the question. if the two plants are not the staple of this area, then the conclusion that " tetracycline in their food probably explains the low incidence of typhus among ancient Nubians." cannot be true.

thanks

[stamps]

答案Ｅ用了絕對字"only"
題目只說在Nubian的主食:tetracycline在beer&bread中有,但沒有說Nubian“只“吃這二種食物

[ilovecushi]

i got it now! thanks for helping