单项选择题
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A.In the coffee shop.
B.Discussing physical problem in the classroom.
C.Working on a science problem at home.
D.Reading 20th century literature in the hbrary.
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单项选择题
A.Crowded air traffic.B.The large size of airplanes.C.Mistakes by air traffic controllers.D.Bad weather.
A.Crowded air traffic.
B.The large size of airplanes.
C.Mistakes by air traffic controllers.
D.Bad weather.
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单项选择题
A.Different countries.B.Income, race and age.C.Americans.D.Both men and women who are interested in lt.
A.Different countries.
B.Income, race and age.
C.Americans.
D.Both men and women who are interested in lt.
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