问题
单项选择题
关于参考导联和双极导联的区别，正确的是（）。
A.参考导联记录的是每个记录电极周围的绝对电位，而不是电位差
B.无论参考导联还是双极导联记录的都是两个电极之间的电位差
C.参考导联和双极导联都会受到耳电极活化的干扰
D.一个记录电极在参考导联上显示为负相波，那么在双极导联上也为负相波
E.双极导联的定位意义总是优于参考导联
答案
参考答案：B
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关于参考导联和双极导联的区别，正确的是（）。
A.参考导联记录的是每个记录电极周围的绝对电位，而不是电位差
B.无论参考导联还是双极导联记录的都是两个电极之间的电位差
C.参考导联和双极导联都会受到耳电极活化的干扰
D.一个记录电极在参考导联上显示为负相波，那么在双极导联上也为负相波
E.双极导联的定位意义总是优于参考导联
参考答案：B
A rich man was camping alone on a hill. One day it began to rain and the rain made the tent wet. At last he 1 make his way home. As he passed a beautiful house he 2 to look for rest. A lady in 3 walked past him with her 4 holding up high. Following her were her two pretty daughters. They stopped and stared at him 5 . “Who are you? We don’t like tramps（流浪汉）going around 6 our home .”one of them shouted. “Go away at once. ”cried the other. “But I’m not a 7 . ”said the man, “All I want is food and stay for the night.” “How 8 you come here? Go away at once!” they 9 “We don’t like your feet around our house. Go, go!” The man moved on and reached a 10 house. On entering it he saw a 11 preparing their supper. Though the light was 12 and the furniture was poor, it made him feel 13 and comfortable. “Can I have some 14 and rest for the night?” he asked. “Of course, friend,” said the woman, bringing forward a little chair for him. “We are going to15 our supper. Come and 16 us.” The food was not 17 but they shared it with the stranger. That night they let him sleep on their bed 18 they themselves used the stable（厩）. Early the next morning, the man said good-bye to them. Their 19 left him a memory full of thanks. When he reached home he 20 ordered a lovely house to be built for the couple in the woods.
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