问题
单项选择题
先天性心脏病的发病机制（）
A.单基因突变
B.染色体异常
C.孕期感染
D.遗传与环境因素及其相互作用
E.孕期射线或特殊药物、毒物接触史
答案
参考答案：D
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先天性心脏病的发病机制（）
A.单基因突变
B.染色体异常
C.孕期感染
D.遗传与环境因素及其相互作用
E.孕期射线或特殊药物、毒物接触史
参考答案：D
| 阅读短文，根据短文内容，从短文后的五个选项中选出能填入空白处的最佳选项。 选项中有一项为多余选项。 | |
hated hard work and stayed in the city. Once something was wrong with his ear. He had to see a doctor. The doctor looked him over and gave him some medicine. And five minutes later he had to pay the doctor twenty dollars. 2 . So he came to the small town and opened a hospital. At first the people there knew nothing about him and they came to see him. 3 . And his medicine wasn't useful. People hardly came and he had nothing to do. One evening he heard a knock at the door. He got up quickly and saw a traveler lying in front of his hospital. He thought he had a bad cold and he asked him to take some medicine. 4 . The following morning he was told the traveler died in a hotel. On the third day a young man came in and said, "Thank you very much, doctor!" It surprised Mr Johnson. He said,"I haven't seen you before. What do you thank me for?" "My uncle died from your wrong treatment the day before yesterday and he left much money to me." |