Text 4 Although, recent years have seen substantial reductions in noxious pollutants from individual motor vehicles, the number of such vehicles has been steadily increasing. Consequently, more than 100 cities in the U. S. still have levels of carbon monoxide, particulate matter, and ozone that exceed legally established limits. There is a growing realization that the only effective way to achieve further reduction in vehicle emissions—short of a massive shift away from the private automobile—is to replace conventional diesel fuel and gasoline with cleaner-burning fuel such as compressed natural gas, liquefied petroleum gas, ethanol, or methanol. All of these alternatives are carbon-based fuels whose molecules are smaller and simpler than those of gasoline. These molecules burn more cleanly than gasoline, in part because they have fewer, if any, carbon-carbon bonds, and the hydrocarbons they do emit are less likely to generate ozone. The combustion of larger mo
A. be somewhat lighter in total body weight than a conventional vehicle fueled with gasoline
B. have a larger and more powerful engine than a conventional vehicle fueled with gasoline
C. average more miles per gallon than a "gasoline alone" vehicle fueled with methanol
D. have a larger and heavier fuel tank than a "gasoline alone" vehicle fueled with methanol
Passage Two Everybody may have seen the film "Death on the Nile (尼罗河) ," but nobody can imagine that the writer of the story, Agatha Christie, saved a baby in a most unusual way. In June 1977, a baby girl became seriously ill in Deleville. Doctors there were unable to find out the cause of her illness, so she was sent to a famous hospital in London, where there were many excellent doctors. The baby was so seriously iii that a team of doctors hurried to examine her without any delay. The doctors, too, were puzzled by the baby’s illness, and they also became discouraged. Just then a nurse asked to speak to them. "I think the baby is suffering from thallium (铊) poisoning," said the nurse~ "A few days ago, I read a story ’A Pale Horse’ written by Agatha Christie. Someone uses thallium poison, and all the symptoms (症状) are written in the book. They are exactly the same as the baby’s." "You’re very good at observin
A. a doctor in Deleville
B. a famous doctor
C. Agatha Christie
D. an ordinary nurse
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