单项选择题

A．Bad weather.
B．The large size of airplanes.
C．Mistakes by air traffic controllers.
D．Crowded air traffic.
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单项选择题
A．Have her copies made outside the library.B．Use a different machine to make her copies.C．Read the article while she waits in line.D．Look for a different magazine article.
A．Have her copies made outside the library.
B．Use a different machine to make her copies.
C．Read the article while she waits in line.
D．Look for a different magazine article.
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