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【单选题】
关于多普勒效应,下述说法正确的是：A.
多普勒效应是由于波的干涉引起的
B.
多普勒效应说明波源的频率发生变化
C.
多普勒效应是由于波源和观察者之间有相对运动而产生的
D.
只有声波才有多普勒效应
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【单选题】From the findings of the study, we learn that______.
A.
people in poor countries are more inactive than those in wealthy ones
B.
young people move less than the aged
C.
the rates of inactive among women tend to be higher than those of men
D.
in Finland, women exercise more than men in the country
【单选题】Injuries and deaths were relatively less in Los Angeles because the quake occurred at 4:31 a.m. on a holiday, when traffic was light on the city’s highways. In addition, changes made to the constructi...
A.
new computers had been installed in the buildings
B.
it occurred in the residential areas rather than on the highways
C.
large numbers of Los Angeles residents had gone for a holiday
D.
improvements had been made in the construction of buildings and highways
【单选题】Injuries and deaths were relatively less in Los Angeles because the quake occurred at 4:31a.m.on a holiday when traffic was light on the city's highways. In addition, changes made to the constructions...
A.
new computers had been installed in the buildings
B.
it occurred in the residential rather than on the highways
C.
large numbers of Los Angeles residents had gone for a holiday
D.
improvements had been made in the construction of buildings and highways
【多选题】In order to achieve the American Dream, many young people from poor families struggle along on limited budgets in order to stay in school because they know that a college degree brings _____.
A.
income
B.
great job security
C.
more prestige
D.
a more significant career
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