Kernland imposes a high tariff on the export of unprocessed cashew nuts in order to ensure that the nuts are sold to domestic processing plants. If the tariff were lifted and unprocessed cashew were sold at world market prices, more farmers could profit by growing cashews. However, since all the processing plants are in urban areas, removing the tarriff would seriously hamper the government's effort to reduce urban unemployment over the next five years.
which most seriously weakens the argument?
B Other countires in which cashews are processed subsidize their processing plants
C More people in kernland are engaged in farming cashews than in processing them
为什么选 B？？
In response to viral infection, the immune systems of mice typically produce antibodies that destroy the virus by binding to proteins on its surface. Mice infected with a herpesvirus generally develop keratitis, a degenerative disease affecting part of the eye. Since proteins on the surface of cells in this part of the eye closely resemble those on the herpesvirus surface, scientists hypothesize that these cases of keratitis are caused by antibodies to herpesvirus.
Which of the following, if true, gives the greatest additional support to the scientists’ hypothesis?
A. Other types of virus have surface proteins that closely resemble proteins found in various organs of mice.
B. There are mice that are unable to form antibodies in response to herpes infections, and these mice contract herpes at roughly the same rate as other mice.
C. Mice that are infected with a herpesvirus but do not develop keratitis produce as many antibodies as infected mice that do develop keratitis.
D. There are mice that are unable to form antibodies in response to herpes infections, and these mice survive these infections without ever developing keratitis.
E. Mice that have never been infected with a herpesvirus can sometimes develop keratitis.
为什么选A ， 而不是D???
选E A lack of profitable crops is driving an increasing number of small farmers in kernland off their land and into the cities
B C 没有讲到失业率的问题
C比较迷惑 但是还是无关的
更多的人从事F并不代表会影响失业率，勿自己加逻辑关系
E 则告诉你一条逻辑关系为 F的人不愿意了 ，跑去urban找了，人一多， 肯定就影响了失业率的问题啦
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