问题
单项选择题
关于二尖瓣关闭不全，下列哪一说法不正确()
A．可引起左房、左室扩大
B．存在中、重度反流时，早期症状是呼吸困难，晚期出现心排出量减少引起的疲乏无力
C．第一心音多减弱
D．轻度二尖瓣关闭不全可无症状
E．心界可向左下扩大
答案
参考答案：B
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关于二尖瓣关闭不全，下列哪一说法不正确()
A．可引起左房、左室扩大
B．存在中、重度反流时，早期症状是呼吸困难，晚期出现心排出量减少引起的疲乏无力
C．第一心音多减弱
D．轻度二尖瓣关闭不全可无症状
E．心界可向左下扩大
参考答案：B
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| It was at a concert that I happened to find David. He was holding his head at a strange 1 as if he were staring down at something. Then the truth struck me. He was blind. The last thing he remembers 2 was his daughter being born. Then the world went 3 . Bad luck is no stranger to this 44-year-old man. His mother died of cancer, and his weak father had to 4 11-year-old David to the care of the state. Things seemed always to go from bad to 5 . Two years ago, his beloved guide dog pulled him out of the 6 of a truck. David was not hurt. The dog 7 . But David does not feel sorry for himself. "These are just little obstacles (障碍) you have to 8 in your life," he said. He has to make a daily two-hour trip to his working place-the X-ray department of an 9 room. It was a hard job to 10 . Before he got it, David was determined to escape the workshop run by the Lighthouse, an organization 11 to help blind people. He wanted a job of developing X-ray film, something 12 , not just he, must do in the dark, including people with 13 eyesight. The Lighthouse called many hospitals, with no result, 14 they offered to pay his first three months' salary. David works alone in a dark room that 15 of chemicals. He cannot wear gloves. 16 , he could not feel. Since this is an emergency room, lives can be put 17 or out of danger. His directress says she trusts him 100 percent. He makes $ 20 000 a year. But his motivation (动机) goes 18 money. "By working, I can actualize my own 19 . That's the most important!" he said. What a shining example for us to 20 ! | ||||
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