【单选题】
关于慢性淋巴细胞白血病预后的描述，不正确的是
①
本病病程长短不一，长者存活10余年，平均3~4年。
②
多于诊断后半年内死亡
③
主要死亡原因为骨髓功能衰竭引起的严重感染
④
主要死亡原因为骨髓衰竭引起的贫血。
⑤
主要死亡原因为骨髓功能衰竭引起的出血
【单选题】
佝偻病的发生是由于缺乏（ ）．
①
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②
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③
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④
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