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【单选题】
休克时血压下降的主要机制是A.
心功能不全
B.
外周动脉紧张度不足
C.
交感神经过度兴奋后衰竭
D.
血液中儿茶酚胺过低
E.
微循环障碍，组织灌流不足
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反馈参考答案：
举一反三
【单选题】Which of the following words can best describe her life in the old people's home?
A.
Busy.
B.
Unhappy.
C.
Varied.
D.
Happy.
【单选题】An old woman was badly hurt in ______ the police describe as an apparently motiveless attack.
A.
that
B.
what
C.
whatever
D.
which
【单选题】An elderly mouse is mentioned to
A.
describe the influence of old age on mice.
B.
illustrate the effect of a meager diet on mice.
C.
tell us how mice's liver genes behave.
D.
inform. us of the process of metabolizing drugs.
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