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【单选题】
下列关于胸膜腔内压的叙述,错误的是A.
有利于维持肺的扩张状态
B.
有利于静脉血回流
C.
胸膜腔负压的形成与肺和胸廓的自然容积不同有关
D.
胸膜腔内压总是低于大气压
E.
胸膜腔内压可用测定呼吸过程中食道内压的变化来表示
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【单选题】—I miss my mother very much. She has gone abroad on business for nearly a year but luckily she will be back in a week. —Pardon? I ______ something else just now. ________ will she come back?
A.
was thinking; How long
B.
thought; How often
C.
was thinking; How soon
D.
thought; When
【单选题】— Lucy had __________ accident. — But luckily, she wasn’t hurt in _______ event at all.
A.
a, a
B.
an, an
C.
an, the
D.
the, an
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