皮皮学，免费搜题
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【单选题】
月经血不会发生凝固的原因是A.
因有雌激素阻止血凝
B.
因有孕激素阻止血凝
C.
因子宫内有大量的肝素
D.
因子宫内有丰富的纤溶酶原激活物
E.
因子宫分泌大量前列腺素抑制凝血
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举一反三
【单选题】The best moment for the football star was he scored the winning goal.
A.
when
B.
where
C.
how
D.
why
【简答题】路由选择是在OSI模型中的__________层实现的。
【简答题】He was (disappoint) ______ to hear that the football star would not play that day.
【单选题】She looked upon the football star as her role model ______ yesterday, when she saw him taken away by the police for drug taking on TV. [ ]
A.
when
B.
since
C.
until
D.
after
【单选题】（）包括DNA疫苗和RNA疫苗，由编码能引起保护性免疫反应的病原体抗原的基因片段和载体构建而成。
A.
基因缺失疫苗
B.
核酸疫苗
C.
转基因植物疫苗
D.
合成肽疫苗
【单选题】Fans crowded the airport exit waiting for the football star.
A.
a glance of
B.
a look at
C.
a glimpse of
D.
a sight of
【单选题】The best moment for the football star was _______ he scored the winning goal.
A.
where
B.
when
C.
how
D.
why
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