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【单选题】
最早被人类研究的遗传病是（）。A.
尿黑酸尿病
B.
白化病
C.
慢性粒细胞白血病
D.
镰状细胞贫血
E.
苯丙酮尿症
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B.
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D.
A decrease in the total cost of the project. D An increase in the cost of the project.
E.
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A.
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B.
have died
C.
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D.
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