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GRE·94-10考題—（4）
Moas were tall, flightless birds that lived only in New Zealand.
Before humans settled in New Zealand, moas had no serious predators and
were plentiful. Moas became extinct after humans began hunting them.
So hunting by humans must have caused the moas extinction.
Which of the following, if true, most seriously weakens the argument above?
Some moa species lived in parts of New Zealand that were among the
last to be settled by humans.
Humans in New Zealand hunted a mammalian species that, though vulnerable
to indigenous predators, never became extinct.
Humans introduced to New Zealand several animal species that preyed
on moas.
Moas still existed in some parts of New Zealand approximately 500 years
after the arrival of the first humans in New Zealand.
Some species of moa were able to outrun humans.
————————————————————————
答案：(C)
問題：下面那一個，if true，最嚴重削弱上面的論述？
讀題：Maos是僅存在于新西蘭的一種高大但不會飛的鳥。在人定居新西蘭之前，Maos沒有
什么可怕的天敵，數(shù)量極多。當人們開始獵取它們后，Maos幾乎絕跡了。所以，
肯定是人類的打獵造成了Maos的絕跡。
分析：上面是一個事實，Maos絕跡；認為人類的打獵是原因。
反對： 1、有其他的原因?qū)е缕浣^跡
2、直接說人類的打獵和Maos絕跡無關。
A. 一些Maos棲息在新西蘭人類定居最晚的一部分地區(qū)。
B. 新西蘭人也獵取一種哺乳動物。這種動物雖然也易受本地天敵的攻擊，卻并未滅絕。
C. 人們引入新西蘭好幾種捕食Maos的動物。
�。ú皇谴颢C造成的，而是動物捕殺）
D. 大約第一批人進駐新西蘭500年之后，Maos仍存在于新西蘭的某些地區(qū)。
During six days, Monday through Saturday, a walker is planning to
take five walks—the gorge walk, the lake walk, the pinewoods walk. the
river walk, and the village walk—at a mountain resort. The village
walk requires two entire consecutive days; the other four walks each
require exactly one entire day. The walker s plans will conform to
the following constraints, imposed by the nature of the walks:
The gorge walk must be planned for Monday or else for Tuesday.
Friday and Saturday cannot be the pair of days for which the village
walk is planned.
The lake
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