风湿性心脏病患者，2周来发热，疑有亚急性感染性心内膜炎，下列哪项体征对诊断最有帮助
A．进行性贫血
B．血沉增快
C．白细胞数升高
D．心脏出现新的反流性杂音
E．皮肤有瘀点
参考答案：D
解析：感染性心内膜炎是指微生物感染产生的心内膜及心瓣膜炎症，亚急性感染性心内膜炎一般发生在异常瓣膜，因此出现新杂音，特别是反流性杂音，对诊断最有帮助，而其余四项对诊断虽有帮助，但意义均相对较小。
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| "All men are created equal" is one idea that nearly every American would agree upon. 1 they sometimes betray the idea in their daily lives, they have a deep faith 2 in some fundamental way no one is born superior to anyone else. In the early years of American history, because titles of nobility (贵族) were forbidden, no 3 class system developed in the United States. Firmly believing that being born into a lower class would not 4 them from success and they would have a better chance in Americ  a, thousands of immigrants 5 to leavethe European societies, where their 6 in life was determined 7 by the social class into which they were born. It was because the dreams of many of there immigrants were 8 in their new country, though there might be 9 in some situations, that Americans came to believe in equality of opportunity. Americans do not mean that everyon  e should be 10 equal when they say they believe in equality of opportunity. 11 , they do mean that each person should have an equal chance for success. Abraham Lincoln once said, "We wish to 12 the humblest (最微贱的) man an equal chance to get rich with everybody else. When one starts poor, free society is 13 that he knows he can 14 his condition." However, competition is the price to be 15 for his equality of opportunity. Americans match their energy and intelligence against that of others in a competitive contest for success, because they believe competition 16 the best in any person. Indeed, the pressure of competition causes an American to be 17 , but it also places a constant emotional stress on him. In fact, in a society that gives so much 18 to those "winners", 19 does not compete successfully for whatever reason never 20 into it as well as those who do. | ||||
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