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A. However old she is, a women with some excellent qualities can still maintain her beauty.
B. As a women grows old, her beauty will gradually disappear.
C. Even a plainly dressed woman may have pure and real beauty.
D. A women with a young mind never feels old.

A. inaccuracies in measurement could cause accidents in space missions
B. the speeds of space vehicles will vary
C. accuracy in speed measurement is essential to spaceships
D. a bump could affect the preciseness of the laser-doppler radar