问题
单项选择题
在发达国家，慢性二尖瓣关闭不全的最常见病因是（）
A.风湿性心脏病
B.结缔组织病
C.二尖瓣黏液样变性
D.感染性心内膜炎
E.二尖瓣先天异常
答案
参考答案：C
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在发达国家，慢性二尖瓣关闭不全的最常见病因是（）
A.风湿性心脏病
B.结缔组织病
C.二尖瓣黏液样变性
D.感染性心内膜炎
E.二尖瓣先天异常
参考答案：C
小题2: The ___________ was terrible because the shoe factory used to dump its waste into the river. 小题3:Would you like to study in that ____________ ? 小题4:We had a long ______________ about the question. 小题5:They went to a big hospital for ___________. B） 根据句子意思，用括号中所给单词的正确形式填空。 小题6:This is the _________ time for our school to hold the robot-making contest. (twelve) 小题7:Larry has put on too much weight because of his _________ diet. (health) 小题8:You can’t go on driving if you feel ___________(sleep). 小题9:Mark Twain was a ___________(humour) writer. 小题10:It’s __________(possible) for you to study English well if you don’t work hard. |