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1. The government has warned of possible travel disruptions this winter because the primary chemical used to keep airport runways free of snow and ice is scarce. There are effective alternative chemicals. However, they are environmentally hazardous and thus require special exemptions from the ban on their use. So if the government issued such exemptions to cold-weather airports, travelers would not have to face the warned-of travel disruptions.
Which of the following is an assumption on which the argument depends?
A. There will be a sufficient amount of the alternative chemicals to supply all the airports that need them.
B. The number of winter storms bringing snow and ice this winter is forecast to be no greater than normal.
C. The government has an established policy of issuing exemptions from the alternative-chemical ban when the primary chemical is scarce.
D. The supply of regularly used chemicals that was available before this winter's shortage has been enough to keep flights moving in past winters.
E. If disruptions of flights occur during the winter in question, they will not be caused by a lack of the chemicals used to keep runways free of snow and ice.
2.Natural gas was recently discovered in the economically depressed Region Y, and the Fonidol company has drilled a number of wells there. Subsequently, the water in local residents' water supply became somewhat murky. It is likely that the gas extraction process is in part the cause of this, since extraction involves pumping out large quantities of groundwater. However, very few of the affected residents have complained to authorities about the water quality.
Which of the following, if true, would most help to explain why the residents did not complain to the authorities?
A. Total annual rainfall in Region Y has fluctuated over the last ten years.
B. No expert advice has been obtained on behalf of any of the residents to determine whether the water contains toxic substances.
C. Fonidol was attracted to Region Y as part of a local economic-development effort that attracted extremely strong support throughout the community.
D. Most residents of Region Y pay higher water fees than do residents of other regions of the country.
E. The natural gas reserves in Region Y are expected to run out in approximately forty years.
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发表于 2021-6-27 09:05:56
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