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7) Which sentence in paragraph 3 explains the process of inhibiting the donation blood from changing into a solid state, or forming clots?
A. the third sentence
B. the first sentence
C. There is no sentence like that.
D. the second sentence
8) According to the passage, how often can people donate blood for red blood cells?
A. every four months
B. every month C. every two months
D. every three months
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