T-3-Q23. GWD-13-32

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....

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

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

第一楼的mm说的是

要加强，就要把 Ma 如何与nitrates相关阐述出来，才是推论有理