求教GWD17 Q11

11. GWD17-Q11:
            

Some species of Arctic birds are threatened by recent sharp increases in the population of snow geese, which breed in the Arctic and are displacing birds of less vigorous species.  Although snow geese are a popular quarry for hunters in the southern regions where they winter, the hunting season ends if and when hunting has reduced the population by five percent, according to official estimates.  Clearly, dropping this restriction would allow the other species to recover.

Which of the following, if true, most seriously undermines the argument?

A.    Hunting limits for snow geese were imposed many years ago in response to a sharp decline in the population of snow geese.

B.    It has been many years since the restriction led to the hunting season for snow geese being closed earlier than the scheduled date.

C.    The number of snow geese taken by hunters each year has grown every year for several years.

D.    As their population has increased, snow geese have recolonized wintering grounds that they had not used for several seasons.

E.     In the snow goose’s winter habitats, the goose faces no significant natural predation.

答案B

百思不得其解. 求救高人~~

每一年限制都提前比前一年提前结束，结束的时候就说明snow geese少了百分之5，变量不变，hunting的速率不变，题目中隐含，只说明总量在不段减少。那么说明snow geese的数量没有上升反而下降，weaken的是文章第一句，第一句不存在，后面也不存在，是most weanken。一般题目中出现most，肯定有几个weaken要作比较的。

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