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Passengers must exit airplanes swiftly after accidents, since gases released following acc

idents are toxic to humans and often explode soon after being released. In order to prevent passenger deaths from gas inhalation, safety officials recommend that passengers be provided with smoke hoods that prevent inhalation of the gases. Which of the following, if true, constitutes the strongest reason not to require implementation of the safety officials recommendation？

A．Test evacuations showed that putting on the smoke hoods ridded considerably to the overall time it took passengers to leave the cabin.

B．Some airlines are unwilling to buy the smoke hoods because they consider them to be prohibitively expensive.

C．Although the smoke hoods protect passengers from the toxic gases, they can do nothing to prevent the gases from igniting.

D．Some experienced flyers fail to pay attention to the safety instructions given on every commercial flight before takeoff.

E．In many airplane accidents, passengers who were able to reach emergency exits were overcome by toxic gases before they could exit the airplane.

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更多“Passengers must exit airplanes…”相关的问题

第1题

In Swartkans territory, archaeologists discovered charred hone fragments dating hack 1 mil

lion years. Analysis of the fragments, which came from a variety of animals, showed that they had been heated to temperatures no higher than those produced in experimental campfires made from branches of white stinkwood, the most common tree around Swartkans. Which of the following, if true, would, together with the information above, provide the best basis for the claim that the charred bone fragments are evidence of the use of fire by early hominids?

A．The white stinkwood tree is used for building material by the present-day inhabitants of Swartkans.

B．Forest fires can heat wood to a range of temperatures that occur in campfires.

C．The bone fragments were fitted together by the archaeologists to form. the complete skeletons of several animals.

D．Apart from the Swartkans discovery, there is reliable evidence that early hominids used fire as many as 500 thousand years ago.

E．The bone fragments were found in several distinct layers of limestone that contained primitive cutting tools known to have been used by early hominids.

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第2题

It can be inferred from the passage that which of the following is true of Fabian s theory

?

A．It did not receive approval until Canizares" work was published.

B．It was not widely accepted in the 1970"s.

C．It did not receive support initially because technology was not available to confirm its tenets.

D．It supports earlier speculation that intergalactic gas was largely the result of explosions outside the galaxy.

E．It was widely challenged until x-ray evidence of gas temperatures in NGC 1275 had been presented.

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第3题

According to the passage, Fabian believes that gas flowing into a central galaxy has which

of the following characteristics?

A．It is one-tenth hotter than it was in the outer regions of the galaxy cluster.

B．It emits radiation with wavelengths that change as the gas moves toward the center of the galaxy.

C．The total amount of radiation emitted diminishes as the gas cools.

D．It loses 90 percent of its energy as it moves to the center of the galaxy.

E．It condenses at a rate much slower than the rate of decrease in temperature as the gas flows inward.

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第4题

According to the passage, one reason that the authors gave rats carbohydrates was toA．depr

According to the passage, one reason that the authors gave rats carbohydrates was to

A．depress the rats" tryptophan levels.

B．prevent the rats from contracting diseases.

C．cause the rats to produce insulin.

D．demonstrate that insulin is the most important substance secreted by the body.

E．compare the effect of carbohydrates with the effect of proteins.

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第5题

According to the passage, the speed with which tryptophan is provided to the brain cells o

f a rat varies with the

A．amount of protein present in a meal.

B．concentration of serotonin in the brain before a meal.

C．concentration of leucine in the blood rather than on the concentration of tyrosine in the blood after a meal.

D．concentration of tryptophan in the brain before a meal.

E．number of serotonin-containing neurons present in the brain before a meal.

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第6题

The passage suggests which of the following about N/C automation in the machine-tool indus

try?

A．It displaced fewer skilled workers than R/P automation did.

B．It could have been implemented either by experienced machinists or by computer engineers.

C．It was designed without the active involvement skilled machinists.

D．It was more difficult to design than R/P automation was.

E．It was technically superior to R/P automation.

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第7题

It can be inferred from the passage that, compared with the requirements of law, the perce

ntage goals set by "some federal and local agencies "(line 18)are

A．more popular with large corporations.

B．more specific.

C．less controversial.

D．less expensive to enforce.

E．easier to comply with.

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第8题

The passage suggests that the failure of a large business to have its bids for subcontract

s result quickly in orders might cause it to

A．experience frustration but not serious financial harm.

B．face potentially crippling fixed expenses.

C．have to record its efforts on forms filed with the government.

D．increase its spending with minority subcontractors.

E．revise its procedure for making bids for federal contracts and subcontracts.

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第9题

John: I have tried several different types of psychotherapy at various times in my life: t

hree kinds of "talk" therapy(Freudian, Rogerian, and cognitive)and also behavior. therapy. Since the periods when I was in therapy were the least happy times of my life, I have concluded that psychotherapy cannot work for me. Which of the following statements, if true, would most weaken Johns conclusion?

A．Behavior. therapy is designed to address different problems from those addressed by "talk" therapies.

B．The techniques used in behavior. therapy are quite different from those used in "talk" therapies.

C．People who try several different types of psychotherapy tend to be happier than people who try only one type of psychotherapy.

D．People who try several different types of psychotherapy are more likely to find one that works for them than are people who try only one type of psychotherapy.

E．People undergoing psychotherapy that ultimately works are often unhappy while they are in therapy.

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第10题

People often recall having felt chilled before the onset of a cold. This supports the hypo

thesis that colds are, at least sometimes, caused by becoming chilled; it is the chill that allows a rhino virus, if present, to infect a person. Which of the following, if true, most seriously weakens the force of the evidence cited above?

A．Being chilled is a form. of stress, and stress lowers the defenses of a person" s immune system, which guards against infection.

B．After a rhino virus has incubated in a person for several days, the first symptom it causes is a feeling of chilliness.

C．People who are tired and then become chilled are more likely to catch severe colds than are people who are chilled without being tired.

D．Some people who catch colds are not sure what it was that allowed them to catch cold.

E．Rhino viruses are not always present in the environment, and so a person could become chilled without catching a cold.

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