单项选择题

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.
单项选择题
A．She died across from the US Department of Housing and Urban Development.B．US Department of Housing and Urban Development threw the dead woman out onto the street.C．She died in Washington D. C. , the nation’s capital.D．No one cared about the homeless woman.
A．She died across from the US Department of Housing and Urban Development.
B．US Department of Housing and Urban Development threw the dead woman out onto the street.
C．She died in Washington D. C. , the nation’s capital.
D．No one cared about the homeless woman.
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