gwd17-34急求问

xinyp

额，想错了，crab只是下降了，但不是绝迹了。剩下的crab可以慢慢下蛋。这个选项是在解释crab为什么数量下降，属于无关项。

ggxxtogether

我也来尝试解释.请指教.

My opinion: 结论是，只要remaining longer in Delaware就会no serious threat to the migrating shorebird populations。结论：不会影响它们的数量。理由，能够吃到足够的蛋。E 答案对于结论的削弱，在于提出他因影响数量。

草草的小巫

不同意GawainERIC的观点,原题说的是不会对迁徙中（migrating）的shorebird的population带来影响，而不是会对其迁徙活动带来影响！！Ｅ选项中谈到ｂｒｅｅｄｉｎｇ，自然是影响其ｐｏｐｕｌａｔｉｏｎ的因素了。

[此贴子已经被作者于2008-10-19 15:46:46编辑过]

vivien_hu

以下是引用ggxxtogether在2008-7-7 17:02:00的发言：

我也来尝试解释.请指教.

My opinion: 结论是，只要remaining longer in Delaware就会no serious threat to the migrating shorebird populations。结论：不会影响它们的数量。理由，能够吃到足够的蛋。E 答案对于结论的削弱，在于提出他因影响数量。

ding

vivien_hu

我想题目给出的逻辑关系是：在D待得越久——吃到足够蛋——可以完成迁徙——不会影响S数量

E选项：是越早完成迁徙——S成功生育

成功生育=不会影响S数量

果一致，但是因是相反的。。。所以削弱

欢迎指正

balabaladou7

以下是引用ggxxtogether在2008-7-7 17:02:00的发言：

我也来尝试解释.请指教.

My opinion: 结论是，只要remaining longer in Delaware就会no serious threat to the migrating shorebird populations。结论：不会影响它们的数量。理由，能够吃到足够的蛋。E 答案对于结论的削弱，在于提出他因影响数量。

这个说到点儿上了。

bwxz

During the month of May, crabs arrive on Delaware’s beaches to lay eggs.  Certain shorebirds depend on these eggs for food during their annual spring migration to their northern breeding grounds.  Delaware’s crab population has declined recently.  This decline, however, poses no serious threat to the migrating shorebird populations:  by remaining longer in Delaware, the birds will be able to eat enough crab eggs to allow them to complete their migration.

原文结论是：通过remain LONGER, 鸟就能吃够eggs 来完成他们的migration.

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

1. No other food available to the birds on Delaware’s beaches is as nutritious and accessible as are crab eggs.
                   

2. The decline in the number of crabs on Delaware’s beaches is due to the harvesting of crabs by humans.
3. There are more crabs on Delaware’s beaches than in any other area that the migrating birds pass through. 
           
4. The crabs do not conceal their eggs.
5. The earlier in the season the shorebirds complete their migration, the more likely they are to breed successfully.

 只有e选项说的内容与时间有关啊 而且还是用比较的形式写出来的 多好的选项啊 

  

tiffany1102

......

elaine1031

up