OG-161

katherineal

哪位能帮忙看一下这个文章是什么意思啊，看懂了，可是不明白这是怎么推的？

161. Adult female rats who have never before encountered rat pups will start to show maternal behaviors after being confined with a pup for about seven days. This period can be considerably shortened by disabling the female’s sense of smell or by removing the scent-producing glands of the pup.

 

Which of the following hypotheses best explains the contrast described above?

(A) The sense of smell in adult female rats is more acute than that in rat pups.

(B) The amount of scent produced by rat pups increases when they are in the presence of a female rat that did not bear them.

(C) Female rats that have given birth are more affected by olfactory cues than are female rats that have never given birth.

(D) A female rat that has given birth shows maternal behavior toward rat pups that she did not bear more quickly than does a female rat that has never given birth.
            E

(E) The development of a female rat's maternal interest in a rat pup that she did not bear is inhibited by the odor of the pup.
                

eddienumb

那些成年雌鼠在和幼鼠相处七天后才会显示出母性。这个时间可通过让成年雌失去嗅觉或通过移开的嗅觉腺体来缩短。 e说成年雌鼠对孩子的母性被 他们的孩子的臭味所抑制  大概是这个意思

nickynicky

还是不能明白这道题目

根据题干，adult female rats显示出母性是因为她的能闻到pup散发出来的味道

如果让pup不能散发味道，或者让adult female rats的嗅觉失灵，那她显示木星的时间就会缩短

这里面有什么contradict啊？

更不明白为什么选E了，求NN解答！

nickynicky

一语惊醒梦中人

多谢！

neverblue203

“从来没有遇到rat pup”(指没有生育过的成年雌性rats)成年雌性rats,在与a pup相处7天时间,才能显示maternal behavior.这个时间段可通过成年雌失去嗅觉或通过移开的嗅觉腺体

来减少

来减少.

意思(矛盾点)

1,需要7天时间,成年雌性rats可以显示maternal behavior.

2,如果没有smell,只需要4天时间,成年雌性rats可以显示maternal behavior.

因为:smell阻碍,成年雌性rats.显示maternal behavior.

出现选项:

A:female与rat pup比较.

B rat pup,自己的反应.

C/D,(given birth)Female rats与(nevergive birth) Female rats比较.

E才是描述:never give birth的rats的行为.

其实,题目自始自终都是描述never give birth的rats行为.在有smell情况下,他的行为和没有smell,他的行为变化快和慢.

lucalin

谢谢LS，解释得很清晰