GMAT 考试|GMAT考试-Testprep数学精解(12)

The death penalty is appropriate for traitors^{1 because it is right to execute}

those who betray their own country and thereby^{2 risk the lives of millions.}

This argument is circular because right means essentially^{3 the same thing a}

s appropriate. In effect， the writer is saying that the death penalty is a

ppropriate because it is appropriate.

Shifting The Burden Of Proof

It is incumbent^{4 on the writer to provide evidence or support for her positio}

n. To imply that a position is true merely because no one has disproved it i

s to shift the burden of proof to others.

Example：

Since no one has been able to prove God's existence， there must not be a God

There are two major weaknesses in this argument. First， the fact that God's

existence has yet to be proven does not preclude^{5 any future proof of existen}

ce. Second， if there is a God， one would expect that his existence is indepe

ndent of any proof by man.

Unwarranted Assumptions

The fallacy of unwarranted assumption is committed when the conclusion of an

argument is based on a premise^{6 （implicit7 or explicit8） that is false or unwa}

rranted. An assumption is unwarranted when it is falsethese premises^{9 are u}

sually suppressed or vaguely^{10 written. An assumption is also unwarranted when}

it is true but does not apply in the given contextthese premises are usua

lly explicit.

Example： （False Dichotomy）

Either restrictions^{11 must be placed on freedom of speech or certain subversiv}

e elements in society will use it to destroy this country. Since to allow th

e latter to occur is unconscionable， we must restrict freedom of speech.

The conclusion above is unsound because

（A） subversives^{12 do not in fact want to destroy the country}

（B） the author places too much importance on the freedom of speech

（C） the author fails to consider an accommodation between the two alternativ

es

（D） the meaning of freedom of speech has not been defined

（E） subversives are a true threat to our way of life

The arguer offers two options： either restrict freedom of speech， or lose th

e country. He hopes the reader will assume that these are the only options a

vailable. This is unwarranted. He does not state how the so-called subversi

ve elements would destroy the country， nor for that matter， why they would

want to destroy it. There may be a third option that the author did not ment

ion； namely， that society may be able to tolerate the subversives and it m

ay even be improved by the persity of opinion they offer. The answer is （C

）。

Appeal To Authority

To appeal to authority is to cite an expert's opinion as support for one's o

wn opinion. This method of thought is not necessarily fallacious. Clearly， t

he reasonableness of the argument depends on the expertise of the person b

eing cited and whether she is an expert in a field relevant to the argument.

Appealing to a doctor's authority on a medical issue， for example， would be

reasonable； but if the issue is about dermatology and the doctor is an orth

opedist， then the argument would be questionable^13.

Personal Attack

In a personal attack （ad hominem）， a person's character is challenged instea

d of her opinions.

Example：

Politician： How can we trust my opponent to be true to the voters？ He isn't

true to his wife！

This argument is weak because it attacks the opponent's character， not his p

ositions. Some people may consider fidelity^{14 a prerequisite15 for public office}

History， however， shows no correlation^{16 between fidelity and great politica}

l leadership.

I would fly you to the moon and back

If you'll be if you'll be my baby

Got a ticket for a worldswhereswe belong

So would you be my baby