Politician: Some proponents of unilateral nuclear arms reduction argue that it would encourage other countries to reduce their own nuclear arsenals, eventually leading to an international agreement on nuclear arms reduction. Our acting on the basis of this argument would be dangerous, because the argument ignores the countries presently on the verge of civil wars. These countries, many of which have nuclear capability, cannot be relied upon to conform to any international military policy.

Summarize Argument: Causal Explanation
The politician concludes that it would be dangerous to follow the argument for unilateral arms reduction, since nuclearized countries on the verge of civil war can’t be relied on to reduce their nuclear arsenals in turn.

Identify Conclusion
The conclusion makes a case against the politician’s country acting on unilateral arms reduction: “Our acting on the basis of this argument would be dangerous.”

A
Countries that are on the verge of civil wars are unlikely to agree to reduce either their nuclear arms or their conventional weapons.
This is a premise that supports the politician’s conclusion. Since countries on the verge of civil war are unlikely to reduce their arsenals, unilateral arms reduction wouldn’t achieve broad disarmament.
B
Unilateral nuclear arms reduction by the politician’s country would encourage all countries to reduce their nuclear arsenals.
This is a component of the reasoning that the politician argues against embracing. The politician believes there are risks that this line of reasoning doesn’t factor in.
C
Many countries cannot be relied upon to disclose the extent of their nuclear capability.
This doesn’t appear in the politician’s argument. The politician says many countries can’t be relied upon to conform to international military policy, but we don’t know anything about specifically disclosing their nuclear capability.
D
It is unlikely that an international agreement on nuclear disarmament will ever be achieved.
This doesn’t appear in the politician’s argument. The politician simply states that unilateral disarmament wouldn’t be wise at the present time.
E
It is risky for the politician’s country to unilaterally reduce nuclear arms in hopes of achieving an international agreement on arms reduction.
Since many countries wouldn’t follow international military policy, unilateral arms reduction wouldn’t achieve its aims. It’s risky to give up weapons when other countries aren’t doing the same.

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Advertisement: Auto accidents are the most common cause of whiplash injury, a kind of injury that is caused by a sudden sharp motion of the neck. However, many other types of accidents can produce a sudden sharp motion of the neck and thereby result in whiplash injury. A sudden sharp motion of the neck can be caused by a fall, a bump on the head, or even by being shoved from behind. That is why you should insist on receiving Lakeside Injury Clinic’s complete course of treatment for whiplash after any accident that involves a fall or a bump on the head.

Summarize Argument
The author concludes that after any accident that involves a fall or bump on the head, you should get Lakeside Clinic’s complete course of treatment for whiplash. This is based on the fact that whiplash is caused by a sudden, sharp movement of the neck, and many things can result in a sudden, sharp movement of the neck, including a fall or a bump on the head.

Notable Assumptions
The author assumes that every fall or bump on the head involves a sudden, sharp movement of the neck. The author also assumes that there aren’t significant harmful effects from a complete course of treatment for whiplash that might weigh against going through the treatment.

A
Being shoved from behind rarely causes whiplash.
The conclusion doesn’t say that people should get whiplash treatment after being shoved from behind.
B
Auto accidents often involve falling or being bumped on the head.
This doesn’t suggest that the whiplash treatment isn’t appropriate for every fall or bump on the head.
C
Nonautomobile accidents other than those involving falls or bumps on the head also occasionally cause whiplash injuries.
This doesn’t suggest that the whiplash treatment isn’t appropriate for every fall or bump on the head.
D
It is very uncommon for falling or being bumped on the head to result in a sudden sharp motion of the neck.
This calls into question the assumption that every fall or bump on the head involves a sudden, sharp movement in the neck. This shows we might not need whiplash treatment for some falls or bumps on the head.
E
The appropriate treatment for whiplash caused by a fall or a bump on the head is no different from that for whiplash caused by an auto accident.
The author never suggested that we need a different treatment for auto accidents. The author’s position is just that we should get whiplash treatment (regardless of whether it’s the same as that for auto accidents) for all falls and bumps on the head.

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Safety expert: Tuna is often treated with carbon monoxide so that it will not turn brown as it ages. Treating tuna with carbon monoxide does not make it harmful in any way. Nonetheless, there is a danger that such treatment will result in more people getting sick from eating tuna.

"Surprising" Phenomenon

Why might treating tuna with carbon monoxide cause more people to get sick from eating tuna when the carbon monoxide treatments don’t make the fish harmful in any way?

Objective

The right answer will introduce some reason why treating tuna with carbon monoxide might cause more people to get sick from eating tuna. That reason cannot be a direct health risk of the carbon monoxide treatment, because the stimulus tells us that the treatment doesn’t make the tuna harmful. Instead, the answer must describe some causal impact that the treatments have on the way tuna is consumed.

A
Workers in fish processing plants can be sickened by exposure to carbon monoxide if the appropriate safety procedures are not followed at those plants.

The stimulus says that the carbon monoxide treatments might cause more sickness specifically from eating tuna. If we were looking for a reason why the carbon monoxide treatments might cause more people to get sick in general, this would be perfect.

B
Over the last several years, tuna consumption has increased in most parts of the world.

This has nothing to do with the carbon monoxide treatments, so it doesn’t help resolve the discrepancy.

C
Tuna that is treated with carbon monoxide provides no visible indication when it has spoiled to the point that it can cause food poisoning.

This explains why treating tuna with carbon monoxide might cause more people to get sick from eating tuna: if people can’t see that the tuna has gone bad, they might eat spoiled tuna (ew) and get sick! With untreated tuna, people are more likely to see when the fish goes bad.

D
Treating tuna with carbon monoxide is the only way to keep it from turning brown as it ages.

This doesn’t provide any information about how the carbon monoxide treatments might lead to more people getting sick from eating tuna, so it doesn’t help resolve the discrepancy.

E
Most consumers strongly prefer tuna that is not brown because they believe that brown tuna is not fresh.

This might explain why companies would want to treat their tuna with carbon monoxide, but it doesn’t provide any information about why the treatments might lead to more people getting sick from eating tuna.


5 comments

Astrophysicist: Gamma ray bursts (GRBs)—explosions of powerful radiation from deep space—have traditionally been classified as either “short” or “long,” terms that reflect the explosion’s relative duration. However, an unusual GRB has been sighted. Its duration was long, but in every other respect it had the properties of a short GRB. Clearly, the descriptive labels “short” and “long” have now outlived their usefulness.

Summarize Argument
The astrophysicist concludes gamma ray bursts (GRBs) should no longer be called “short” or “long.” Why not? Because one recent GRB lasted a long time, but was more like a short GRB in every other way.

Notable Assumptions
The astrophysicist assumes there’s no use in labeling GRBs “short” or “long” if some GRBs are characteristic of the opposite type in every other way. In particular, this means assuming the “short” and “long” labels would only be useful if they always indicate properties of a GRB besides its actual duration.

A
No other GRBs with unusual properties have been sighted.
If anything, this weakens the argument. It suggests keeping the “short” and “long” labels will only lead to issues for a very small number of GRBs.
B
The classification of GRBs can sometimes be made on the basis of duration alone.
If anything, this weakens the argument. It suggests the “short” and “long” labels may still be useful for some GRBs—those for which duration is the distinctive property.
C
Properties other than duration are more important than duration in the proper classification of the unusual GRB.
This implies the “short” and “long” labels are really stand-ins for more important properties of unusual GRBs, which supports the astrophysicist’s contention that they should be abandoned for new labels.
D
GRBs cannot be classified according to the different types of cosmic events that create them.
This is irrelevant. It implies cosmic origin, not duration, is a poor basis for classification.
E
Descriptive labels are easily replaced with nondescriptive labels such as “type I” and “type II.”
This doesn’t mean the descriptive labels “short” and “long” are no longer useful. It’s possible nondescriptive labels would be even less useful than the descriptive ones.

24 comments