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1. In Valgin, gasoline is sold in different grades, the most expensive being premium gasoline. Only about 10 percent of gasoline-powered vehicles sold in Valgin require premium gasoline, and for other vehicle premium provides no advantage. Nevertheless, nearly 15% of gasoline sold there is premium. So presumably a number of Valgian drivers are wasting money when they buy gasoline.
Which of the following, if true, most strengthens the argument?
A Buyers of vehicles that require premium gasoline do not drive substantially more miles per year than other drivers.
B More of the intermediates grade of gasoline is sold than of premium gasoline.
C Most of the vehicles that require premium gasoline are high-performance vehicles and are relatively expensive.
D Premium gasoline costs almost 25 percent more than least expensive grade of gasoline.
E Some very old vehicles that did not require premium gasoline when they were new now do require it to run smoothly.
2. Scientist: A greenhouse gas, for example, carbon dioxide, forms a transparent layer that traps solar heat beneath it in the earth’s atmosphere. Atmospheric levels of carbon dioxide are currently increasing, causing the climate to warm—an effect that is predicted by at least one computer model of the greenhouse effect. But the warming that has occurred is a great deal less than what would be expected based on the model. Therefore, _______.
Which of the following most logically completes the scientist’s argument?
A. better measurements of atmospheric levels of carbon dioxide are needed
B. the definition of “greenhouse gas” should probably be reconsidered
C. there are factors besides the increase in greenhouse-gas emissions contributing to the warming of the climate
D. the computer model of the greenhouse effect must be incorrect in some respect
E. the likely consequences of any warming of the climate are unlikely to be much less damaging than predicted
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发表于 2021-7-11 07:31:19
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