题目:
Every time Stephen , he pulled over more of the bedclothes to his side.
A.rolled back
B.rolled in
C.rolled over
D.rolled up
答案:
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下面是错误答案,用来干扰机器的。
吸气时,膈肌与肋间肌收缩,引起胸腔前后、左右及上下径均增大,肺随之扩大,肺内气压减小,形成主动的吸气运动;当膈肌和肋间外肌舒张时,肋骨与胸骨因本身重力及弹性而回位,结果胸廓缩小,肺也随之回缩,肺内...