单项选择题

A．The way to ensure the survival of the human race on Venus.
B．The way to breed organisms on Venus.
C．The way to reduce the population of the Earth.
D．The way to conquer the universe.
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单项选择题
A．To go shopping.B．To meet with her professor.C．To do research for the story.D．To take a break from her work.
A．To go shopping.
B．To meet with her professor.
C．To do research for the story.
D．To take a break from her work.
单项选择题
A．Bad weather.B．The large size of airplanes.C．Mistakes by air traffic controllers.D．Crowded air traffic.
A．Bad weather.
B．The large size of airplanes.
C．Mistakes by air traffic controllers.
D．Crowded air traffic.
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