皮皮学，免费搜题
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搜题
【单选题】
雄激素治疗再生障碍性贫血的主要机制是（）A.
提高机体免疫力
B.
直接刺激骨髓干细胞增生
C.
减少出血
D.
提高神经细胞的兴奋性
E.
改善骨髓微环境
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举一反三
【单选题】Food supplies in the flood-stricken area ______. We must act immediately before there’s nothing left.
A.
have run out
B.
are running out
C.
have been run out
D.
are being run out
【单选题】Food supplies in the flood-stricken area . We must act immediately before there’s left.
A.
have run out
B.
are running out
C.
have been run out
D.
are being run out
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