小兵张嘎的逻辑难题之二

小兵张嘎

17. Members of the Amazonian Akabe people commonly take an early-morning drink of a tea made from the leaves of a forest plant. Although they greatly enjoy this drink, at dawn they drink it only in small amounts. Anthropologists hypothesize that since this tea is extraordinarily high in caffeine, the explanation for the Akabe's not drinking more of it at dawn is that high caffeine intake would destroy the surefootedness that their daily tasks require.   (20-2)
Which one of the following, if true, most seriously calls the anthropologists' explanation into question?
(A) The drink is full of nutrients otherwise absent from the Akabe diet
(B) The Akabe also drink the tea in the evening, after their day's work is done.
(C) The leaves used for the tea contain a soluble narcotic.
(D) Akabe children are introduced to the tea in only a very weak form.
(E) When celebrating, the Akabe drink the tea in large quantities.



给个思路，多谢！

chipmunk

I'm not so sure about the answer. But I would choose C if I were you. That's my best guess. Anybody else has any thoughts on the question?

shany

前提： this tea is extraordinarily high in caffeine
结论：high caffeine intake would destroy the surefootedness that their daily tasks require.   
削弱题，先否定结论，得到caffeine不会影响到surefootedness. Answer C 提供解释，存在narcotic中和了caffeine的效果。即有其他因素起作用，故削弱。

小兵张嘎

多谢！呵呵，我把答案看成了B，所以打死我也想不通为什么不是C。

Bensontuo

小兵张嘎 发表于 2003-3-30 19:03
17. Members of the Amazonian Akabe people commonly take an early-morning drink of a tea made from th ...

Spot the question type: Weaken

Core of the argument

If at dawn, they only drink in small amounts ---> caffeine intake would destroy the surefootedness that their daily takes required ---> extraordinarily high in caffeine.

Narcotic 是興奮劑的意思。

意思就是說, 也許是因為其他的物質, 而不是咖啡因讓他們少喝。