看不懂啊， 请大哥大姐们帮忙解释下

jackba8888

Economist: On average, the emergency treatment for an elderly person for injuries resulting from a fall costs $11000. A new therapeutic program can significantly reduce an elderly person's chances of failing. Though obviouslysirable for many reasons, this treatment program will cost $12500 and thus cannot be justified

Which of the following, if true, most seriously undermines the conclusion of the argument?

A. Among elderly people who had followed the program for only a few months ,the number of serious falls reported was higher than it was for people who had followed the program for its recommended minimum length of one year.
B. Falls resulting in serious injuries are less common amongelderly people living in nursing homes than they are among elderly people who live alone at home.
C. A frequent result of injuries sustained in falls is long-term pain, medication for which is not counted among the average per-person costs of emergency treatment for elderly people's injuries from such falls.
D. The new therapeutic program focuses on therapies other than medication ,since onvermedication cancause disorientation
and hence increase the likelihood that an elderly person will have a serious fall.
E. A significant portion of the cost of the new therapeutic program is represented by regular visits by health care professionals, the costs of which tend to increase more rapidly than do those of other elements of the program.

看不懂啊， 请大哥大姐们帮忙解释下

jackba8888

顶起，急啊！！！

peishiqi8911

结论涉及医药花费   答案必定和花费有关。a b d  无关 只 看c e
c说  摔了之后是个长期治疗的过程， 但是以前的治疗的花费被低估了。削弱了结论
e  是说这个 新的疗法以后明显会涨价   支持了结论

jackba8888

虽然还是没有很明白，可是谢谢你

jackba8888

The rate of a certain chemical reaction is directly proportional to the square of the concertration of chemical A present and inversely proportional to the concentration of chemical B present. If the concentration of chemical B is increased by 100 precent, which of following is closest to the percent change in the concentration of chemical A required to keep the reaction rate unchanged?

1. 100% decrease
2. 50% decrease
3. 40% decrease
4. 40% increase
5. 50% increase