单项选择题

A. Red.
B. Black.
C. White.
D. Not all of the above.

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单项选择题
What did NASA do with the water filter technology（）

A. It invented the water filters.
B. It improved the water filters.
C. It abandoned the water filters in spaceships.
D. It popularized the water filters in the 1950s.
单项选择题
A) A visit to a prison. B) The influence of his father. C) A talk with some miserable slaves. D) His experience in the war between France and Austria.
A) A visit to a prison.
B) The influence of his father.
C) A talk with some miserable slaves.
D) His experience in the war between France and Austria.
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