11. The cities with the densest population have the highest ratio of police officers to citizens. Such cities also have the lowest rates of property crime without contact between perpetrator and victim. Thus maintaining a high ratio of police officers to citizens can serve as an effective deterrent to at least certain kinds of property crime.
Which of the following, if true, most seriously weakens the argument above?
(A) The quality of training that police receive varies from city to city.
(B) High population density itself makes it difficult to commit a property crime that involves no contact between perpetrator and victim.
(C) Many nonviolent crimes in large cities are drug-related.
(D) A majority of the perpetrators of property crimes in densely populated cities are not apprehended by the police.
(E) Property crimes without contact between perpetrator and victim represent only a small proportion of overall crime.
答案是E,可以解释一下B和E的选项吗
13. Of those person who became teachers in 1968 and who later left the profession, 30 percent today earn salaries above $35,000 a year: of those who became teachers in 1968 and have remained in the profession, only 15 percent today earn salaries above $35,000 a year. These figures indicate how underpaid teachers are today.
The argument above depends on which of the following assumptions about the persons for whom statistics are cited?
(A) At least one-third of the group of persons who have remained in teaching would today be earning more than $35,000 a year if they had left teaching.
(B) The group of persons who left teaching and the group who did not are comparable in terms of factors that determine how much people outside the teaching profession are paid.
(C) Most of those persons who left teaching did so entirely because of the low salaries teachers earn.
(D) As a group, those persons who have remained in teaching are abler and more dedicated than the group of persons who left teaching.
(E) The group of persons who left teaching and who today earn more than $35,000 a year were more capable teachers than the group who remained in the profession.
答案释B可以解释一下B,C,D,E这四个选项吗,各有什么错,和为什么要选B谢谢
11，我认为应该选B，你对答案确定吗？
13，原文部份说通过离开教师行业和留在教师行业的人的薪水对比，得出教书UNDERPAID，前提是原文统计数字里的人物具有代表性，能代表教师这个群体，所以B是对的。
11题答案是b,我选的是才是e,我一定昏头了,有几题答案都写错了,真是不好意思
我怎么觉得第二题应该选c
前提:30%的老师薪水3500 ; 现在只有15%的老师薪水有3500
结论:目前老师薪水下降
中间缺了个"桥"-数量和薪水的联系,所以只有c对啊,老师工资下降,老师离开!
不明白为什么选b??
我来试着解释一下.
11题:原文的逻辑是由于警察数量不够,所以造成了身体接触的犯罪,因此增加警察的数量可以防止类似现象的发生.问削弱:
找它因,否定原因,说由于城市本身人多，所以这一事实本身就不能减少身体接触的犯罪,因此警察再多也没有用了.
13题:对于类似的题目有个特点,即两组比较,前提一定是两组要一样,或者说可比,B就说两组可比.
C只是解释了老师当年为什么要走,是因为工资水平低,但无法得出今天老师的工资水平也低的结论,而原文的结论是说今天老师的工资水平低,所以无关,另外取非后,说老师当年走不是因为工资水平低并不影响今天老师工资水平低的结论,所以不是前提.
D说全部留下来的老师和走的老师比较能力更强,但是取非以后,结论依然成立,因为留下来的老师和走的老师水平一样,并不影响结论成立.
E是加强了结论,而不是前提.
前提只能是一个,就是可比,我的观点,请NN再解释一下吧.
13，原文部份说通过离开教师行业和留在教师行业的人的薪水对比，得出教书UNDERPAID，前提是原文统计数字里的人物具有代表性，能代表教师这个群体，所以B是对的。
(B) The group of persons who left teaching and the group who did not are comparable in terms of factors that determine how much people outside the teaching profession are paid.
B选项该怎么翻译呢, "outside the teaching profession" 只说了代表"非教师群体", "代表教师群体"是怎么理解出来的呢?
谢谢先..
再顶....
我觉得B是：针对决定非教师行业的人的薪水高低的各种因素，离开教师行业的人和继续留在教师行业的人具有可比性。
B取非，通俗一点就是：在非教师行业中，有很多决定薪水的因素，对于这些因素，那些继续当老师的人和那些离开老师行业的人不具有可比性。（比如：IT行业，决定薪水的某个因素是计算机认证的个数，而离开教师行业的人比留在教师行业的人拥有的认证个数要多（也就是两类人在这个决定薪水的因素下不具有可比性）因此这些人工资要高。而不是结论说的教师的工资低是因为这个行业的工资低，即使这些教师离开教师行业，加入IT行业，他们的薪水还是要比那些拥有多个计算机认证的人要低。B相当于排除了其他可能的因素，而只留下文中说的由于行业不同，而造成工资不同。）
不知道说清楚没有。
非常清楚! 谢谢cicilla 
知道B为什么对了, 又看了两遍题,怎么觉得A也对呢,A也是说离开和没离开有相同的实力得到高工资啊(有相同比例的人能得到35000元以上),能再解释一下吗,谢谢....
ERCENT不符所以A选项不对呢?等待中....
My two cents:
1. "at least one-third of the group" is not convincing
2. choice A looks more like an evidence instead of assumption...
13题涉及比较。你首先要找准比较的对象：left的人和remained的人。注意，是全体left的人和全体remained的人，A中说1/3 remained的人，缩小了比较对象的范围，不对。
还有一个准则是，原文涉及两个对象的比较，求假设，那么答案应该也涉及两个对象的比较。A只说了remained的人，没有提到left的人，显然不对。
这些城市也有最低的财产犯罪率，这些犯罪是没有受害人和罪犯接触的。没看上下文直译的
11题，原文：高人口密度的城市有着高密度的警察，同时这些城市有着最低的罪犯与受害人不相接触的财产方面的犯罪率（可能是入室盗窃）。所以保持高密度的警员配备至少能够有效遏制某些财产方面的犯罪。
找削弱
就是找其他的原因来解释为何这些城市能够保持“最低的罪犯与受害人不相接触的财产方面的犯罪率”
B 因为高人口密度的原因
很明显因为人多，所以人和人之间接触的机会多，不接触的机会少，罪犯与受害人不相接触的财产方面的犯罪率就会少，接触的就会多（譬如偷窃）
11题的E选项，是不是可以这样理解，
即使非直接接触的犯罪占的比例在小，如果police增多可以减少这种犯罪的话，这种办法也是可行的，而不如B选项直接就排除的police增多是没有用的
(B) The group of persons who left teaching(離開教書群體) and the group who did not(未離開群體) are comparable in terms of factors that determine how much people outside the teaching profession(教師群體) are paid.
題目結論是說These figures indicate how underpaid teachers are today.
所以為了確保離開教書群體與未離開教書群體夠具代表性,能夠代表整個低薪教師團隊
,因此B對
希望有點幫助
11题E项
无关。文中谈的是警察比例与接触犯罪的关系。此选项讲的是接触犯罪的比例，所以无关
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