She blushed at the _________ (mention) of her lover's name.
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Drinking is a ________ (principle) cause of highway deaths.
We're going to __________ (focus on) the relationship between freedom and necessity.
A chemist can _________ (isolation) the oxygen from the hydrogen in water.
下列预防和治疗术后肺不张的措施，哪项是不恰当的？
A. 鼓励咳痰
B. 防止呕吐
C. 术前锻炼深呼吸
D. 术后胸腹部切口应紧紧固定或绑扎
E. 减少肺泡和支气管内分泌物增多，如术前2周戒烟
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