36套E15第一篇阅读一道题。。。

candy_shmilyUID：3449020

文章
Typically the queen honeybee is mother to all the bees in a hive; after mating with several male drones from other colonies, she lays fertilized eggs that develop into all-female worker bees and lays unfertilized eggs that become all-male drones. According to natural selection theory, a worker would enhance her fitness-or ability to propagate her genes-by hatching her own eggs in addition to or in place of the queen's. But a typical worker's fitness would be diminished if other workers' sons, who have less genetic material in common with the worker, supplanted the queen's sons (the worker's brothers). Researchers, testing the hypothesis that workers usually somehow block each other's attempts to reproduce, put unfertilized eggs laid by workers and by the queen into a hive. Other workers quickly devoured the workers' eggs while leaving the queen's eggs alone.

题目
3.        The passage best supports which of the following inferences about the fitness of honeybees?
(A)        Reproduction diminishes any individual honey-bee's fitness.
(B)        An individual worker's fitness can be maintained
without the individual herself reproducing.
(C)        A hierarchy of stronger and weaker individuals among the worker bees determines which individuals will reproduce when a queen dies.
(D)        While a queen reigns, the fitness of the worker bees is increased and that of the drones is diminished.
(E)        Fitness encourages worker bees to hatch
honeybee eggs without regard for the relatedness of the young to the "parent".

答案B
实在想不通

我选的是D 认为workers都去吃别的workers‘ sons 然后drones岂不是越来越少了？

:dizzy: 求解答。。。谢谢

candy_shmilyUID：3449020

我2了 发现不能选D因为queen's eggs are left alone
但是为什么要选B啊 其实B选项我都没看懂啊衰:dizzy:

candy_shmilyUID：3449020

木有人么么么。。。。。。。。。。。。。
T^T

986630036UID：3433799

candy_shmily 发表于 2013-10-23 23:00
木有人么么么。。。。。。。。。。。。。
T^T

我一开始也没看懂。貌似lz没读懂文章，文章说left是指的是queen没死的时候，挡死的时候那就是另一回事了。

fayehyfUID：3476681

说是的如果其他女蜂的儿子代替了女王的儿子，一个女蜂的fitness会下降，因为其他女蜂的儿子的基因和这个女蜂的基因一样的少，所以女蜂们都希望自己或者自己的女儿和queen的儿子mate。所以如果有女蜂的儿子进入了queen的巢，这些卵就会被其他女蜂吃掉，以保证这个世界上只有queen的儿子。

选项排除法，A不对，CDE都没提，所以只能选B

但是这题好难，如果时间短我肯定选不出来

candy_shmilyUID：3449020

986630036 发表于 2013-10-23 23:09
我一开始也没看懂。貌似lz没读懂文章，文章说left是指的是queen没死的时候，挡死的时候那就是另一回事了。 ...

恩恩 是这样 谢谢你
其实我木有明白B选项是什么意思 就算用排除法也选得心惊胆战

candy_shmilyUID：3449020

fayehyf 发表于 2013-10-24 15:47
说是的如果其他女蜂的儿子代替了女王的儿子，一个女蜂的fitness会下降，因为其他女蜂的儿子的基因和这个女蜂 ...

是的呀。。。搞不懂B是什么意思 不敢选

yoyowyfUID：3546077

我的理解是读完文章后会发现，worker bee如果自己reproduce的话有两种结果：
1. She mates with the queen bee's son (the worker's brother) and hatch her own eggs. This would result in an ENHANCED fitness.
2. She mates with other worker bee's soon and hatch her own eggs.  This would result in a DIMINISHED fitness as indicated in line 9.
所以，反过来想，如果她不reproduce的话，她就可以MAINTAIN fitness....所以B正确

Electron_VoltUID：3557764

文章前面说 理论上根据natural selection，worker bee照顾自己的egg会enhance her fitness

But a typical worker's fitness would be diminished if other workers' sons supplanted the queen's sons
说明her fitness会diminished如果other's sons 取代了queen's son，这样即使她reproduce自己的eggs，fitness也会下降。但是如果她不reproduce自己的eggs而是控制别人的eggs，她的fitness就会maintain
所以B是对的

candy_shmilyUID：3449020

yoyowyf 发表于 2014-9-5 09:52
我的理解是读完文章后会发现，worker bee如果自己reproduce的话有两种结果：
1. She mates with the queen ...

囧 这么久远的坟被刨出来了= =
还是谢谢你的热心回复啦~

candy_shmilyUID：3449020

Electron_Volt 发表于 2014-9-5 15:13
文章前面说 理论上根据natural selection，worker bee照顾自己的egg会enhance her fitness

But a typica ...

囧 这么久远的坟被刨出来了= =
还是谢谢你的热心回复啦~

yoyowyfUID：3546077

candy_shmily 发表于 2014-9-13 12:39
囧 这么久远的坟被刨出来了= =
还是谢谢你的热心回复啦~

自己也在做题所以搜到的啦～～ 分享下自己的感想，觉得说不定会帮到别的也在做题目的人 哈哈～～

hot13399UID：3598120

But a typical worker's fitness would be diminished if other workers' sons supplanted the queen's sons.
这样就好理解了。

senGoUID：3763174

http://baike.baidu.com/link?url= ... NnDh89nZM_NigTi4jp_

逆否命题，原命题成立则逆否命题成立
But a typical worker's fitness would be diminished if other workers' sons supplanted the queen's sons.

第一次发现GRE还可以这样出题
btw 楼主应该出国了吧