患者女性，22岁，发热1个月余。查体：贫血貌，心率100次／分，胸骨左缘3、4肋间3级收缩期杂音伴震颤，血红蛋白70g／L，血沉20mm／h，血培养一次未找到细菌，最可能的诊断是（）
A.亚急性感染性心内膜炎
B.急性心肌炎
C.风湿性心脏病
D.风湿活动
E.再生障碍性贫血
参考答案：A
解析：应在抗生素应用前连续2次血培养。
| 补全对话。 | |
| A: Mr. Fred, you often help children. 1 B: Yes, of course. Children often write to me and ask me how to solve their problems. A: 2 B: Many can't decide when to study and when to play. I think they should learn to achieve a balance between study and play. A: I agree. Sometimes I get too much homework and 3 B: You must feel stressed from time to time, right? A: Yes. Can you give me some advice? B: OK. 4 A: I see. Any more? B: Yes. You can also get help from youth workers at your own school. A: Thanks for your advice. B: 5
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