单项选择题

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
The space agencies are reluctant to open up space to tourists.
A．Y
B．N
C．NG
单项选择题
A．Jealous.B．Indignant.C．Negative.D．Proud.
A．Jealous.
B．Indignant.
C．Negative.
D．Proud.
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