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问题 单项选择题

为了免除客人受所携带婴幼儿的托累，方便客人外出或其它活动，饭店可为客人提供（）。

A、baby service

B、baby sitting

C、child service

D、child sitting

答案

参考答案：B

单项选择题

Which of the following, if true, provides the most logical completion of the passage below
Cars fueled by methanol have a much lower level of emissions of pollutants such as carbon monoxide and environmentally harmful hydrocarbons than gasoline-fueled cars do. Methanol fuel does produce somewhat higher formaldehyde emissions than gasoline does. Nevertheless, a methanol-powered car actually produces less atmospheric formaldehyde pollution than a comparable gasoline-powered car, because （）.

A．compared to carbon monoxide and some hydrocarbons produced by gasoline-powered cars, formaldehyde pollution is not a serious threat to the environment

B．the technical difficulties involved in mass producing methanol-powered cars will prevent them from seriously competing with gasoline-powered cars for several years

C．gasoline-powered cars are required by United States law to be equipped with catalytic converters that reduce emissions of many pollutants

D．measuring a car’s emissions is generally an accurate method of assessing that car’s contribution to atmospheric pollution

E．most formaldehyde pollution generated by gasoline-powered cars results from the photochemical conversion of hydrocarbon emissions into formaldehyde in the atmosphere
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问答题 简答题

脑灌注显像在早老性痴呆诊断中有何应用价值?
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