问题
单项选择题
为了探讨某一疾病在不同国家人群中的发病率差异是环境因素或遗传因素所致，常用（）。
A、遗传流行病学
B、血清流行病学
C、移民流行病学
D、描述流行病学
E、理论流行病学
答案
参考答案：C
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为了探讨某一疾病在不同国家人群中的发病率差异是环境因素或遗传因素所致，常用（）。
A、遗传流行病学
B、血清流行病学
C、移民流行病学
D、描述流行病学
E、理论流行病学
参考答案：C
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| A teenage girl couldn't stand her parents' family rules, so she left home. She wanted to be 1 But she had poor education and several years later she had to ask for food on the street for a living. Now her father has died. Her mother is an old woman. But she is still 2 her daughter. She has been to every corner of the city. Everywhere she goes, she 3 a big photo of herself on the wall. At the lower part of the photo she writes," I still love you..., 4 home!" One day, the daughter saw one of the photos. The face was familiar (熟悉). "Is that my mother?" She moved closer and read the 5 : I still love you... She cried. When she got home, it was early morning. She 6 the door. The door opened itself. She rushed to her mother's 7 . Her mother was sleeping. She woke her mother up,"It's me! Your 8 is back home!" The mother and daughter held each other, full of 9 tears (眼泪). The daughter asked," Why is the door not locked? A thief could get in." The mother answered 10 , "The door has never been locked since you left." The door of parents' love for their children will never be closed. | |||
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