填空题

Why is the spaceflight of the seven crew members of the space shuttle Discovery called one of the biggest risk of their lives

【参考答案】

Because they have a 1-in-100 chance of dying．
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A．How ancient philosophers measured the distance between heavenly bodies.B．How ancient philosophers explained the cause of an eclipse of the Moon.C．Why ancient philosophers thought the Earth was a sphere.D．Why ancient philosophers thought the Earth moved around the Sun.
A．How ancient philosophers measured the distance between heavenly bodies.
B．How ancient philosophers explained the cause of an eclipse of the Moon.
C．Why ancient philosophers thought the Earth was a sphere.
D．Why ancient philosophers thought the Earth moved around the Sun.
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