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Laughter is needed in our lives and the lives of people around us. The more you make your friends , the more they will ______________________.

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To be friendly and to be charming is not an art. The only need is to pay _ attention to ourselves and to others.

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患者，男，58岁，因肺心病并发呼吸衰竭入院。入院查体神志清楚，动脉血气分析：PaO2 30 mmHg，PaCO2 60mmHg。吸氧后神志不清，昏迷，动脉血气分析PaCO2 70mmHg，又转变为80 mmHg。本例病情恶化的原因可能是 (1分)

A. 感染加重
B. 心力衰竭加重
C. 气道阻力增加
D. 氧疗不当
E. 周围循环衰竭