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【单选题】
促使下肢静脉血回流心脏的因素不包括A.
胸腔内负压
B.
下肢肌收缩
C.
有深浅静脉与动脉伴行
D.
心脏的搏动
E.
下肢静脉瓣膜的单向阀门作用
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【单选题】So tired _____ after a whole day ’ s heavy work that I _____ stand on my feet.
A.
was I; could hardly
B.
was I felt; could hardly
C.
was I; couldn ’ t hardly
D.
I was; hardly couldn ’ t
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【简答题】BEING an astronaut sounds cool, doesn’t it? In space, they get to do some pretty amazing things, like floating(漂浮) in zero gravity(重力). However, there are also plenty of things that astronauts can’t d...
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