单项选择题

One of the most provocative ideas of modern physics was initiated by the British theorist P. Dirao.

A．stimulating
B．popular
C．enduring
D．powerful
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单项选择题
From what we read we can infer that it was a normal day in the life of the American Red Cross in Greater New York means its staff ______.
A．deal with the fail of houses in the city every day
B．are busy helping people who suffer from disasters every day
C．work during the day and to have banquet in the evening every day
D．go to Harlem, the poorest district of New York, every day and help people there
单项选择题
According to the passage, ethnology is ______.
A．a new branch of biology
B．an old Greek science
C．a pseudo-science
D．a science for amateurs
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