gwd13-23我认为该答案有误,请牛牛们看看

kallyli · 发表于 2006-8-8 19:43:00

115. GWD-13-Q32*:
Macrophages are cells that play a role in the response of the immune system of mice and other mammals to invasive organisms such as bacteria. Unlike other mice, mice that are genetically incapable of making these particular cells do not show elevated levels of nitrates when infected with bacteria.

The statements above, if true, provide the most support for which of the following conclusions?

A. Mice that are unable either to make macrophages or to make them in sufficient numbers will protect themselves from bacterial infections in some other way.
B. Mice that show elevated levels of nitrates can easily fight off most types of bacterial infections.
C. In mice, macrophages play a role in the production of nitrates or inhibit a process by which nitrates are broken down or otherwise eliminated.
D. When a healthy mouse becomes infected with an invasive organism, the number of macrophages in the mouse’s body decreases.
E. Injections of nitrates into mice that lack macrophages will not enhance the ability of these animals’ immune systems to fight off infection.

key C, I prefer B

从题中条件可以看出有Macrophage的老鼠必定有nitrates，只是说二者的同时存在关系，至于是谁引发谁很难说，也许是nitrates导致了Macrophage的产生也说不定。那B很清楚得表明二者的同时存在关系，Macrophage可以抵制感染，B说有nitrates的老鼠（即有Macrophage的老鼠）可以抵制感染。B有一点小问题是它说到的easily这个程度在文中没有出现，但是从优选择的话还是应该选B。其他项都不对。

请牛牛们看看。谢谢了

gonghao · 发表于 2006-8-8 22:42:00

没有说nitrates水平上升能抵御infection

止知道

非Macrophages－－》非nitrates

Macrophages－－－》nitrates

Macrophages本身在免疫系统中起一定的作用

C是对 Unlike other mice, mice that are genetically incapable of making these particular cells do not show elevated levels of nitrates when infected with bacteria的改写

即Macrophages－－－》nitrates

Macrophages能产生nitrates，防止nitrates下降或消除。

－－－－－－－－－－－－－－－－－－－

B：Mice that show elevated levels of nitrates can easily fight off most types of bacterial infections。有nitrates 水平上升的老鼠能很容易的对抗感染。

文章只是说没有Macrophages就没有nitrates，正常的就有Macrophages就有nitrates。但是是Macrophages对免疫系统而且只是起一定作用而已，并非能容易的对抗。

B的most和easily都有问题。另外，有nitrates就有Macrophages似乎也推不出。文章只是说，有Macrophages－－－》有nitrates。倒推是有问题的。

kallyli · 发表于 2006-8-8 23:05:00

以下是引用gonghao在2006-8-8 22:42:00的发言：

没有说nitrates水平上升能抵御infection

止知道

非Macrophages－－》非nitrates

Macrophages－－－》nitrates

Macrophages本身在免疫系统中起一定的作用

C是对 Unlike other mice, mice that are genetically incapable of making these particular cells do not show elevated levels of nitrates when infected with bacteria的改写

即Macrophages－－－》nitrates

Macrophages能产生nitrates，防止nitrates下降或消除。

－－－－－－－－－－－－－－－－－－－

B：Mice that show elevated levels of nitrates can easily fight off most types of bacterial infections。有nitrates 水平上升的老鼠能很容易的对抗感染。

文章只是说没有Macrophages就没有nitrates，正常的就有Macrophages就有nitrates。但是是Macrophages对免疫系统而且只是起一定作用而已，并非能容易的对抗。

B的most和easily都有问题。另外，有nitrates就有Macrophages似乎也推不出。文章只是说，有Macrophages－－－》有nitrates。倒推是有问题的。

thanks you gonghao NN

我只能再把我反对的理由陈述一下. 高亮的部分我不知道您是怎么推出来的. 应该是从" Unlike other mice, mice that are genetically incapable of making these particular cells do not show elevated levels of nitrates when infected with bacteria."推出来的吧,可是这个show不能表明是非M导致了非n,更推不出M导致n.这里选项c应该讲犯了一个逻辑上的错误. 而B虽然不完美却没有逻辑上的硬伤,相较而言应该选B.

gonghao · 发表于 2006-8-8 23:14:00

非Macrophages－－》非nitrates

mice that are genetically incapable of making these particular cells do not show elevated levels of nitrates when infected with bacteria

没有制造出Macrophages，在感染时，就没有nitrates

我的“＝＝＝＝》”不是推理，而是表现一个事实，

非Macrophages，就，非nitrates，

而其他的是有Macrophages，就，有nitrates

C在Macrophages，有nitrates之间进行了连接。连接的依据是，infection和play role in immune system.

fection:有Macrophages，有nitrates

fection和immune system有联系。immune和Macrophages有联系。

C也可以作为对于【有Macrophages，有nitrates】的一种解释。使之合理。

gonghao · 发表于 2006-8-8 23:18:00

感染－－－免疫系统－－－Macrophages

有Macrophages 也有nitrates

没有Macrophages 没有nitrates

问结论，把Macrophages 和nitrates之间建立联系。得出C的结论

kallyli · 发表于 2006-8-8 23:29:00

以下是引用gonghao在2006-8-8 23:18:00的发言：

感染－－－免疫系统－－－Macrophages

有Macrophages 也有nitrates

没有Macrophages 没有nitrates

问结论，把Macrophages 和nitrates之间建立联系。得出C的结论

gonghao gg,

高亮部分没有问题，问题是最后一句话，“得出C结论”

高亮部分的意思是“M,n同时存在,而且不一定有因果联系" ,
c的结论是"M导致n,二者有因果联系".

以上两句话哪句错了?如果没有错只能是划线部分错了.

kallyli · 发表于 2006-8-8 23:30:00

这道题不是加强,而是infer题...

yaoyao99 · 发表于 2006-8-9 00:35:00

1. macrophages kills bacteria
2. mice without macrophages => nitrates don't increase when infected with bacteria

missing link between 1 and 2: macrophages produce nitrates to kill bacterias => C
(infer) mice with macrophages => nitrates increase when infected with bacteria

B still isolates 1. You need something that brings together macrophages and nitrates.

yaoyao99 · 发表于 2006-8-9 00:37:00

http://forum.chasedream.com/dispbbs.asp?boardID=24&ID=75201&page=1

lawyer_1 · 发表于 2006-8-9 02:57:00

MUST BE TRUE题

原文给的信息:MICE感染细菌时,分两种情况:1.没有M细胞的,N没有升高.2.有M细胞的,N升高(这里理解UNLIKE很重要).

特别注意原文没有提供信息说M在免疫系统起的是何作用,好的,还是坏的.(原文的第一句话很容易被误解成M对细菌起免疫作用).单纯这点,B就不是答案.加上B的MOST原文没有任何信息.

答案C来源于原文第二句话:N和M细胞的关系

本贴相关题目 TN-11-CR-23TN-11-CR-23
TN-23-CR-10
... (CPTF)

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gwd13-23我认为该答案有误,请牛牛们看看