GWD两题

GWD-14:

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?C（B）

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.

觉得B有点摸不着头脑。。。虽然C感觉也不是很好。。。

Kate:  The recent decline in numbers of the Tennessee warbler, a North American songbird that migrates each fall to coffee plantations in South America, is due to the elimination of the dense tree cover that formerly was a feature of most South American coffee plantations.

Scott:  The population of the spruce budworm, the warbler’s favorite prey in North America, has been dropping.  This is a more likely explanation of the warbler’s decline.

Which of the following, if true, most seriously calls Scott’s hypothesis into question? D（A）

A.      The numbers of the Baltimore oriole, a songbird that dose not eat budworms but is as dependent on South American coffee plantations as is the Tennessee warbler, are declining.

B.       The spruce-budworm population has dropped because of a disease that can infect budworms but not Tennessee warblers.

C.      The drop in the population of the spruce budworm is expected to be only temporary.

D.      Many Tennessee warbler have begun migrating in the fall to places other than traditional coffee plantations.

觉得A是可以的，但是觉得D好像也说的通（给出他因，因为鸟跑去其他地方了，所以数量减少。。。）。。。不知道错在什么地方。。。

39. GWD17-Q39:

Which of the following most logically completes the passage?

On the whole, scientists do their most creative work before age forty, a tendency that has been taken to show that aging carries with it a loss of creative capacity.  An alternative explanation is that by age forty most scientists have worked in their field for fifteen or more years and that by then they have exhausted the opportunity for creative work in that field.  Supporting this explanation is the finding that __C____.（B）

A.      the average age of recipients of scientific research grants is significantly greater than forty

B.       a disproportionately large number of the scientists who produce highly creative work beyond age forty entered their field at an older age than is common

C.      many scientists temper their own expectations of what they can achieve in their research work by their belief that their creativity will decline as they age

D.      scientists who are older than forty tend to find more satisfaction in other activities, such as teaching and mentoring, than they do in pursuing their own research

E.       there is a similar diminution of creativity with age in nonscientific fields, such as poetry and musical composition

不明白呀不明白。。。B好像在削弱嘛。。。C为什么不对呢？