请教GWDTN24-11的两道语法题

1.下面这题在网上已有一定的争议。主要聚焦于B和D。我觉得B推向极端后，似乎可以加强和削弱。而支持D者则认为，D讨论了一个分析样本大小的问题：acre多的话，更有说服力。请大家指点：）

Scientists have made genetic modifications to cotton to increase its resistance to insect pests. According to farmers’ report, the amount of insecticide needed per acre to control insect pests was only slightly lower for those who tried the modified seed than for those who did not. Therefore, since the modified seed costs more than ordinary seed without producing yields of higher market value, switching to the modified seed would be unlikely to benefit most cotton farmers economically.

Which of the following would it be most useful to know in order to evaluate the argument?

A.      Whether farmers who tried the modified cotton seed had ever tried growing other crops from genetically modified seed.

B.       Whether the insecticides typically used on ordinary cotton tend to be more expensive than insecticides typically used on other crops.

C.      Whether for most farms who grow cotton it is their primary crop

D.      Whether the farmers who have tried the modified seed planted as many acres of cotton, on average, as farmers using the ordinary seed did.

E.       Whether most of the farmers who tried the modified seed did so because they had previously had to use exceptionally large quantities of insecticide.

2. 下面这题我的看法：

原文：Macrophages 是immune的一种response. mice的Macrophages 少那么nitrates不会上升。

首先请教：conclusion是上面两句中的哪一句？这关系到解题。

第二，我对B的分析。B指出N上升可以fight off 细菌，由此，似乎补上了原文两句之间的GAP.   M上升——>N上升——>immune上升。不知道这样理解是否有理？

第三，我对C的分析。M可以保存并且生产N.显然，这句支持了第二句话：M少——>N不上升。似乎也是支持。

请教各位高人了！

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.

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.