[求助]Lsat-11-1-8

Lsat11-1-8

8. Of 2,500 people who survived a first heart attack, those who did not smoke had their first heart attack at a median age of 62. However, of those 2,500 people who smoked two packs of cigarettes a day had their first heart attack at a median age of 51. On the basis of this information, it can be concluded that nonsmokers tend to have a first heart attack eleven years later than do people who smoke two packs of cigarettes a day.

The conclusion is incorrectly drawn from the information given because this information does not include

(A) the relative seventy of heart attacks suffered by smokers and nonsmokers

(B) the nature of the different medical treatments that smokers and nonsmokers received after they had survived their first heart attack

(C) how many of the 2,500 people studied suffered a second heart attack

(D) the earliest age at which a person who smoked two packs a day had his or her first heart attack

(E) data on people who did not survive a first heart attack

请教，Of 2,500 people who survived a first heart attack怎样理解，是2500人都是从第一次心脏病中活下来，还是2500人中有一些活下来，另一些死了。看了以前的解释http://forum.chasedream.com/dispbbs.asp?boardID=24&ID=5875&page=50

觉得没太懂，however 后的2500与前面的2500指的是同一批人呀。

怎么推出来的呢？

1。“Of 2,500 people who survived a first heart attack”指第一次心脏病活下来的2500人中。即2500人都是从第一次心脏病中活下来。WHO后面修饰PEOPLE。OF表示后面的人（THOSE WHO DIDNOT SMOKE）属于这2500人。

2。我的黄皮书上，OF THOSE 2500后面有逗号，即people who smoked two packs of cigarettes a day 这些人属于2500人中。句子结构同第一句。

3。第一二句的2500是否同一班人？答案是。理由是第二句的THOSE。英文的意思是：being the persons, things, ideas,ect. which are understood or have just been mentioned.即使上文提到的。

4。推理同2楼，原文只是统计第一次得心脏病没死去的，没统计死去的。故不准确