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【单选题】
小肠是主要消化吸收部位的原因是 ( )
A.
肌织膜发达，蠕动强而有力；粘膜与粘膜下层皱折形成环状皱襞、小肠绒毛
B.
小肠是消化管道中最长的一段；粘膜与粘膜下层皱折形成环状皱襞、小肠绒毛
C.
小肠腺能分泌大量的消化酶，有很强的消化分解能力；
D.
小肠内含有胰液、胆汁和小肠液：小肠绒毛内有中央乳糜管、毛细血管
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A.
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B.
The plot is the sequence of events.
C.
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D.
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B.
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A.
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树脂道
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A.
生物碱
B.
树脂道
C.
挥发油
D.
粘液腔
E.
乳汁管
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