亲，帮忙看一下这几道题

xiaoyu612

M 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 level of nitrates when infected with bacteria.the statements above,if ture, provide the most support for which of the following conclusions?
A mice that are unable either to make M 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, M 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 ecomes infected with an invasive organism, the number of macrophages in the mouse's body decrease.
E injections of nitrates into mice that lack M will not enhance the ability of these animals' immune systems to fight off infection.
答案C ，可以给解释一下E 为什么不对吗


Out of R fever occur irregularly in East Africa, several years apart.
When outbreaaks do occur, they kill thousands of cattle.A livestock vaccine against the disease exists but is rarely used. It is too expensive for farmers to use routinely, and since it is not effective until a month after vaccination, administering it after an outbreak begins helps very little. Nevertheless , experts predict that use of the vaccine will increase significantly within the next few years.
which of the following, if true, provides the strongest justification for the experts' prediction?
A R ever is spread by mosquitoes, but each outreak is so widespread that it is impractical to control it by using insecticides.
B when an outbreak of  fever ocurs , unaffected countries often refuse to import livestok from the countries affected by the outbreak.
C it would take less than a month for producers of the vaccine to adjust their production operations to cope with a large increase in demand.
D many cattle farmers in east africa are nomadic or live in remote villages, and such farmers, who have little access to modern veterinary medicine, are particularly hard hit by outbreaks of R fever.
E recently published research has shown that certain identifiable climatic onditions are almost invariably followed, within two to five months , by an outbreak of R fever
答案E，可以解释一下这跟天气情况有什么关系吗


in general, jobs are harder to get in times of economic recesion because many businesses cut back operations . However, any future recessions in V will probably not reduct the availability of teaching jobs at government-funded schools, This is because V has just introduced a legal requirement that education i government-funded schools be available , free of charge, to all V children regardless of te state of the economy, and that current student-teacher ratios not be exceeded.
which of the following, if true, most strengthens the argument.
A the current student-teacher ratio at V's government-funded schools is higher than it was during the most recent period of economic recession.
B during recent periods when the V economy has been strong, almost 25 percent of V children have attended privately funded schools,  many of which charge substantial fees.
C nearly 20 percent more teachers are currently employed in V's government-funded schools than had been employed in those schools in the period before the last economic recession.
D teachers in V's government-funded schools are well paid relative to teachers in most privately funded schools in V, many of which rely heavily on part-time.
E during the last economic recession in V, the government permanently closed a number of the schools that it had funded.
答案B，
我觉得这道题得出结论的原因，一是education available,二是teacher 够，所以我选了    D，觉得是因为老师给我钱多， 所以愿意在这里教，请大家指点一二。

orangemoo

第一题:
这是一个归纳题，只要原文没有出现的对象都错。
原文只说：
1．    在免疫系统对抗细菌的时候，M会起一个作用
2．    天生没有m的老鼠被感染时，没有表现出n上升（但其他老鼠感染时会上升）

E.注射n给没有m的老鼠不会提高免疫系统抵抗感染的能力

原文只表明：M会对N的水平有个影响.并未提出n的水平对m或者immune system的影响，因此这一判断是得不到原文支持的.
C是一个接近完美的归纳,指出m要么会产生n,要么会阻止n分解,算是比较严谨了.

jswxshp89

第二题的E，间接表达了R fever的可预测性，问中的routinly是指常规性使用太贵，但是R fever变得可预测之后，这个vaccine就可以针对性使用

第三题，结论是any future recessions in V will probably not reduct the availability of teaching jobs at government-funded schools，后面的because是得出这个结论的原因，这点要明确。

至于B为啥对，因为经济衰退了，人付不起学费了，就去公立学校，享受不花钱的教育了。那么学生增多，学生-教师比例不能变，则教师岗位增多，支持结论。

orangemoo

第二题,选E的原因是,它很好解释了专家的预测:未来几年疫苗使用将会大量上升.
原文指出,困扰是否注射疫苗的原因是:
1.fever发生的不规律
2.太贵,出事后再打又没效果

E.指出新的研究可以预测一种气候,这种气候常伴随fever,意思就是:ferer可以预测.
因此农民伯伯们当然可以放心使用了.