求助LSAT一道题

debbiebeansky

The student body at this university takes courses in a wide range of disciplines.Miriam is a student at this university, so she takes courses in a wide range of disciplines.
which one of the following arguments exhibits flawed reasoning most similar to that exhibited by the argument above？
A. The students at this school take mathematics.Miguel is a student at this school , so he takes mathematics.
B. The editorial board of this law journal has written on many legal issues.Louise is on the editorial board,so she has written on many legal issues.
答案是B 。因为CDE项错得比较明显，所以在此省略了。以下AB两项的解析，也不是很明白：
Answer choice A:There are several points that differentiate the argument in this answer from the argument in the stimulus.First,the reasoning in this answer choice is valid,and that aone makes the answer incorrect .However,most students do not realize that the argument is valid;they are too caught up in analyzing the part-to-whole mechanics in the answer.Second,this answer has the same subject as the stimulus,always a red flag.Third,although it is similar in some ways to the argument in the stimulus,this answer choice focuses on a group where each member performs a single activity:the students take mathematics.If the students take mathematics and Miguel is a student ,then he too would take mathematics.In the stimulus,the focus is on a group that collectively performs many activities—the students at the university "take courses in a wide range of disciplines."Obviously,as a student at the school,Miriam does not have to take courses in different fields and she could stick to a narrow range of disciplines.
Answer choice B:This is the correct answer.Like the stimulus,the focus is on a group that collectivelyperforms many activities:the editorial board of the law journal has "written on nany legal issues."As a member of the edirorial board.Louise need not write on many legal issues.Since the error is identical to that in the stimulus ,this answer is correct.

本人为一名刚入门的小菜鸟，请达人指点，先谢过啦！

annazyan

The property of a group is not necessarily the property of

any member of the same group.

For example, the average age of a group is 23. That does not

mean that every one of that group has to be 23 years-old.

annazyan

As to the parallel-type of LSAT questions, you first

identify the type of the argument, in this case, it is a flawed

argument. Then you screen the answer choices for an argument

that commits the same kind of flaw.

debbiebeansky

Got it.Thanks a lot!