T-3-Q23. GWD-13-32

scorpio2rd

T-3-Q23. GWD-13-32

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.

Answer C

我选A. 实在是不明白这题在说什么能....

myheart2008

就是归纳结论题

mice等动物染细菌时有M细胞回击,别的mice没有这样的细胞,所以细菌来时不能提高N的水平.问可得出什么结论

找有说:M细胞和N有关系的选项

counyo

没有M细胞的老鼠感染细菌后nitrates水平不高，推出有M细胞的老鼠nitrates水平高，所以M细胞起的左右就是增加nitrates

C说的是M能产生nitrates或者阻碍nitrates的消失

ursula_1

第一楼的mm说的是

这道加强题是典型的架桥加强题，assumption. 文中讲的是      Ma 与immune system , 给的论据是mice ,immune system和 nitrates 的关系，丝毫没有提到Ma，而是提了nitrates
                    

要加强，就要把 Ma 如何与nitrates相关阐述出来，才是推论有理

葛佳

b呢 为什么错啊?

葛佳

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

z最后一句话 双重否定 就是说老鼠 M当注射时候可以表现出N的变化

结论是m 和N 有关系

B中can easily fight off most types of bacterial infections 文中没有提到

这样分析是对的么？
请指教

lq0

请问，哪个是结论？~

fanofkaka

我觉得这道题还是有漏洞
Unlike other mice, mice that are genetically incapable of making these particular cells do not show elevated levels of nitrates when infected with bacteria.
mice 基因性缺失M，在面对bacteria时，nitrates水平不会提高
unlike 表明，正常的会提高。
C选项 or 前正确，or防止减少是推不出来的。

某葵

fanofkaka 发表于 2013-4-24 19:49
我觉得这道题还是有漏洞
Unlike other mice, mice that are genetically incapable of making these partic ...

同意。当时做的时候看or后面是防止减少就一下排除了，可是仔细想想别的选项好像也都有问题。。

masaki006

同问C，or后面的内容推不出来呀，所以选的B，
nitrates能提高不就证明有M细胞吗？所以能抵御细菌入侵，错在哪里了？
求NN们指导