GWD 答案让我抓狂

Mayor:  Migrating shorebirds stop at our beach just to feed on horseshoe-crab eggs, a phenomenon that attracts tourists.  To bring more tourists, the town council plans to undertake a beach reclamation project to double the area available to crabs for nesting.

Birdwatcher:  Without a high density of crabs on a beach, migrating shorebirds will go hungry because shorebirds only eat eggs that a crab happens to uncover when it is digging its own nest.

Which of the following, if true, would provide the mayor with the strongest counter to the birdwatcher’s objection?

1. Every year a certain percentage of crabs are caught by fishermen as bait for eel traps.
2. Horseshoe crabs are so prolific that given favorable circumstances their numbers increase rapidly.
3. On average, tourists who come to the town in order to watch birds spend more money there than tourists who come for other purposes.
4. The additional land made available by the reclamation project will give migrating shorebirds more space.
5. Some of the migrating shorebirds make only one stop during their migration form South America to Canada.

我选的是A,因为如果每年crabs都被人捕捉的话,说明它的数量是有弹性的,如果停止捕捉就能增加它的密度.

Which of the following pieces of new evidence would cast doubt on the conclusion drawn above?

1. Using new radiocarbon dating techniques, it was determined that the charcoal from the Colorado site was at least 11,400 years old.
2. Another campsite was found in New Mexico with remains dated at 16,000 years old.
3. A computer simulation of glacial activity showed that it would already have been impossible for humans to travel south overland from Alaska 18,500 years ago.
4. Using new radiocarbon dating techniques, it was proved that an ice-free corridor allowed passage south from the Alaska-Siberia land bridge at least 11,400 years ago.
5. Studies of various other hunting-gathering populations showed convincingly that, once the glaciers allowed passage, humans could have migrated from Alaska to Colorado in about 20 years.

这个答案竟然是B?????

The right answer for Question 1 should be B.

A only stated that certain precentage of crabs were caught by fishmen. But such is not included in the mayor's proposal.

B said that the population is easy to increase, implying provided adequate circumstances,i.e. land, the population of crabs in new areas will increase to the same density as that in the original area. So B is the right answer.

Still, I am confused with Q2, and don't know which to choose.

Next time when you raise a question, would you please be kind enough to show us from where the questions are from so that we check posts discussing them years ago.

好的好的,太急了,不好意思

The right answer for Question 2 should be D

B just repeat the factual information mentioned in the question.

the key to the second question should be D instead

在通道关闭前，18000年前，进来的人在16000年前使用东西，很正常。所以B不是答案