患者女性，35岁。低热，血清ASO水平为300IU/ml，10天后血清ASO水平上升到1200IU/ml。
血细菌培养发现A族β溶血性链球菌阳性，尿蛋白(++)，尿红细胞(++)。进一步体检发现扁桃体Ⅱ°肿大，未见脓点，双眼睑及下肢轻度浮肿，心脏B超未见异常，初步诊断为链球菌感染后急性肾小球肾炎，下列哪项检查结果对诊断急性肾小球肾炎最有价值
A．血清ASO 1200IU/ml
B．血清肌酐18μmol/L
C．血清BUN13.8mmol/L
D．血清补体C3水平显著下降
E．尿纤维蛋白降解产物显著增高
F．ESR 40mm/h
G．外周血白细胞数7.8×109/L
参考答案：D
解析： 急性肾小球肾炎血清补体C3水平显著下降
Texting in the street—your funeral
Millions of people are putting their lives at risk by texting their friends as they walk along busy streets, reported the Daily Mail. One in ten 41 users has already been 42 because they are so lost in their phones that they fail to 43 lamp-posts or cars, according to Joanna Lumdsen of Aston University. To test the danger of texting while 44 , Lumdsen did an experiment in which volunteers followed a 45 path while trying to 46 in a message on the phone. Around them, screens 47 up instructions to avoid stepping on 48 colors on the floor. She found that people missed one in five 49 because they were so busy with their phones. “In 50 life this means that one in five lamp-posts or moving cars is 51 to go unnoticed by people 52 and walking,” she said. Her research is looking for ways cell phone makers could improve the 53 of phones to make texting on the move 54 . That could 55 easier-to-use voice operated phones, or phones that respond to gestures. “The safest thing is 56 people not to text while they walk along,” she said. “ 57 a lot of people in business are 58 to carry a mobile phone and be in 59 24 hours a day, seven days a week. They are under pressure to reply to calls 60 , and to respond to text messages and emails straight away.
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