我总结的七月换题库后JJ 7/16 - 8/16, 已停止更新

littleca

不明白楼上列的式子是什么意思啊？

如果X元是指每个X元，那等式是这样的

GP=50n+50x-3000=1500
n+x=90
(1) N>60 x一定小于40 充分
(2) 不充分
选A

如果X元是指剩下总共卖了x元，那么
GP=50N+X-3000=1500
求（X/50）是否大于40也可以由第一个条件推出来，所以答案还是A

[此贴子已经被作者于2007-7-29 13:04:43编辑过]

newcder

以下是引用tristayang在2007-7-29 11:53:00的发言：

310.ＤＳ新题，关于gross profit的。说买了100个什么东西，每个30元买的；以５０元卖了n，又以x元卖了剩下的；说gross profit是１５００，问剩下的卖的平均价钱是否<40还是〉40不记得了？（题目很长，很搞，这个是我的倒数第三题）

１）n＞６０

２）n＜８０

我记得我选的是Ａ．

50n+x(100-n)-30*100=1500=>n=(4500-100x)/(50-x)

条件1=〉(4500-100x)/(50-x)>60 =〉x<37.5

条件2=〉(4500-100x)/(50-x)<80 =〉x>25 

我的想法：n=(4500-100x)/(50-x)

条件一：当50－X＞0时x<37.5

              当50－X＜0时  x＞50

条件二：当50－X＞0时25<x<50

              当50－X＜0时   x<25

所以应该选E

这道题我考虑的不周到，没有考虑50-x是否大于0，但是我又很奇怪，怎么可能x<37.5 or x>50的时候,gross profit会相同呢？所以我把0<n<100也考虑进来，这样结果就合理了：

50n+x(100-n)-30*100=1500=>n=(4500-100x)/(50-x)

条件1=〉60<n<100 => 60<(4500-100x)/(50-x)<100 [1]

if 50-x>0 , [1]=>x<37.5 & 4500<5000

if 50-x<0, [1]=> x>37.5 & 4500>5000,无解

所以最后结果是x<37.5

条件2=〉0<n<80 =〉0<(4500-100x)/(50-x)<80 [2]

if 50-x>0,  [2]=> 25<x<45

if 50-x<0,  [2]=> x<25 & x>45无解

所以最后结果是25<x<45

答案A

这样做好复杂，NN们有更简单的方法吗？

这样做好复杂，NN们有更简单的方法吗？

[此贴子已经被作者于2007-7-29 13:21:27编辑过]

newcder

以下是引用tristayang在2007-7-29 10:39:00的发言：

33.      Integers 2 to 100 inclusive. How many odd integers among them are not divisible ?选项有2,3,4,5,6.

我看了好久。odd Integers包括3, 5, 7, 9, 11......99.而不能被除的包括。抱歉，实在记不起来了。这题好象做错了。请后人补充。

答案:我算出来21个

我列举了一下是25个呢（3，5，7，11，13，17，19，23，29，31，37，41，43，47。53。59。61，67，71，73，79，83，89，91，97

这个我数错了，回头改

tristayang

同意上面那到gross profit的题选A.

MM很用心，祝你LG取得好成绩！

greenwich

1^n小于等于0.001吗？
1）n小于等于-2
2）n>-5
答案E

这题我又看了看原贴的讨论,提干改为0.1^n<=0.001,

如果这样的话,我选1

请牛牛指正

josefspy

279.      以坐标原点为圆心，以 r 为半径的圆，
  与一条直线的交点有几个？这条直线在y轴上的截距为b, 斜率为m

     1: b^2<r^2

     2: M^2<r^2  (选A）

        答案A

212.      一个圆半径r,圆心是直角坐标系原点,一条直线y=mx+b,问和圆几个交点

A: r>b

B: r>m

答案E 画图作，新的279与之前的212答案不同，

这两题是否是一样的呢，如果是一样我觉得答案是E，因为b<r若b为负且落在圆之外，交点可能会有一个两个或没有交点，楼主觉得呢？

291.      （55）x^2+bx+c的两个解的积

1）其中一个解是3

2）c=6

这题有变化，我选了C。

答案B

这题我也认为是C，与前面55题不一样，这里光只有条件二的解有x=3 and 2, x= -3 and -2, x= 5 and 1, x= -5 and -1不能确定这两个解的值

答案C表示x= 3 and 2

不知如此推理对不对？

[此贴子已经被作者于2007-7-29 17:58:05编辑过]

xinyueli_1983

以下是引用sandywood在2007-7-28 15:20:00的发言：

那个HERBCIDES的CR，我在prep里找到了差不多的：

22.        (28162-!-item-!-188;#058&003858)

 

 

Herbicides allow cereal crops to be grown very efficiently, with virtually no competition from weeds.  In Britain, partridge populations have been steadily decreasing since herbicide use became widespread.  Some environmentalists claim that these birds, which live in and around cereal crop fields, are being poisoned by the herbicides.  However, tests show no more than trace quantities of herbicides in partridges on herbicide-treated land.  Therefore, something other than herbicide use must be responsible for the population decrease.

 

 

Which of the following, if true about Britain, most seriously weakens the argument?

 

 

(A) The elimination of certain weeds from cereal crop fields has reduced the population of the small insects that live on those weeds and that form a major part of partridge chicks' diet.

(B) Since partridges are valued as game birds, records of their population are more carefully kept than those for many other birds.

(C) Some of the weeds that are eliminated from cereal crop fields by herbicides are much smaller than the crop plants themselves and would have no negative effect on crop yield if they were allowed to grow.

(D) Birds other than partridges that live in or around cereal crop fields have also been suffering population declines.

(E) The toxins contained in herbicides typically used on cereal crops can be readily identified in the tissues of animals that have ingested them.

请问这个题的答案是什么啊?

josefspy

RC JJ #41两个学者研究医院对疾病的研究，认为现在的样本数量大，造成储存分析量大而导致成本高，应该减少样本数量．虽然可能使误诊率提高，但是相比较成本是值得的．第二段又说对病的研究要用更广的样本，各类人，别总用健康的，这样才能使研究的利用范围更广．主题是describe.　还有一个说用原来的方法怎样，迷惑是不误诊，应该是成本高吧．

找到原文

1.          GWD-8-Q4-Q6專家建議縮減臨床試驗的樣本數

Frazier and Mosteller
            assert that

medical research could be improved by

a move toward larger, simpler clinical

Line  trials of medical treatments. Currently,

(5)   researchers collect far more background

information on patients than is strictly

required for their trials—substantially more

than hospitals collect—thereby escalating

costs of data collection, storage, and

(10)  analysis. Although limiting information

collection could increase the risk that

researchers will overlook facts relevant

to a study, Frazier and Mosteller contend

that such risk, never entirely eliminable

(15)  from research, would still be small in most

studies. Only in research on entirely new

treatments are new and unexpected variables

likely to arise. F,M的觀點

Frazier and Mosteller propose not

(20)  only that researchers limit data collection

on individual patients but also that

researchers enroll more patients in clinical

trials, thereby obtaining a more representative

sample of the total population with

(25)  the disease under study. Often researchers

restrict study participation to patients

who have no ailments besides those being

studied. A treatment judged successful

under these ideal conditions can then

(30)  be evaluated under normal conditions.

Broadening the range of trial participants,

Frazier and Mosteller suggest, would

enable researchers to evaluate a treatment’s

efficacy for diverse patients under

(35)  various conditions and to evaluate its

effectiveness for different patient subgroups.

For example, the value of a

treatment for a progressive disease may

vary according to a patient’s stage of

(40)  disease. Patients’ ages may also affect

a treatment’s efficacy. F,M的做法

特別套路

邏輯簡圖：

1P: F and M assert that research improved by….. Currently… although, F and M contend that….

2P: F and M propose not only…. .but also, thereby obtaining…. F and M suggest…for example….

--------------------------------------------------------------------------------

 

GWD-8-Q4:

According to the passage, Frazier and Mosteller believe which of the following about medical research?

 

A. It is seriously flawed as presently conducted because researchers overlook facts that are relevant to the subject of their research.

B. It tends to benefit certain subgroups of patients disproportionately.

C. It routinely reveals new variables in research on entirely new treatments.

D. It can be made more accurate by limiting the amount of information researchers collect.

E. It cannot be freed of the risk that significant variables may be overlooked.

Although limiting information collection could increase the risk that researchers will overlook facts relevant to a study, Frazier and Mosteller contend that such risk, never entirely eliminable from research, would still be small in most studies.

--------------------------------------------------------------------------------

 

GWD-8-Q5:

The author mentions patients’ ages(line 40) primarily in order to
            

 

A. identify the most critical variable differentiating subgroups of patients

B. cast doubt on the advisability of implementing Frazier and Mosteller’s proposals about medical research

C. indicate why progressive diseases may require different treatments at different stages

D. illustrate a point about the value of enrolling a wide range of patients in clinical trials

E. substantiate an argument about the problems inherent in enrolling large numbers of patients in clinical trials

 

--------------------------------------------------------------------------------

 

GWD-8-Q6:

The passage is primarily concerned with

 

A. identifying two practices in medical research that may affect the accuracy of clinical trials

B. describing aspects of medical research that tend to drive up costs

C. evaluating an analysis of certain shortcomings of current medical research practices

D. describing proposed changes to the ways in which clinical trials are conducted

Frazier and Mosteller
                assert that medical research could be improved by a move toward larger, simpler clinical trials of medical treatments.

E. explaining how medical researchers have traditionally conducted clinical trials and how such trials are likely to change偏

strayhelloKT

MM实在是人太好了!谢谢,谢谢!

mm 的老公一定会考得好,并如愿申请到好的学校的!

是两个人一起申请吗?祝福!

charzhan

激动和感谢!! 用WORD总结后,看起来效率明显提高!