单项选择题

What was the cause of the tragedy？（）

A．Bad weather.
B．Human error.
C．Breakdown of the engines.
D．Failure of the communications system.

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单项选择题
According to the speaker, which group of people make up the majority of the illiterate population？（）

A．Women.
B．Manual workers.
C．Prisoners.
D．School age children.
填空题
What makes going to space the most expensive vacation is the enormous cost involved in （）.
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