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问题 单项选择题

下列哪一项是病例对照研究的优点（）。

A.是从因到果的研究

B.适用于罕见病的病因研究

C.可计算疾病的发病率

D.不需调查对象的回忆就可获得暴露资料

E.只能进行一种病因的研究

答案

参考答案：B

填空题
选用下列短语并用其正确形式填空。
learn from, give up, take place, at times, a couple of, as for, divide…into,
even though, as a result, for example, cut down, die out, in public
1. The traffic accident ________ when they were passing the corner of the street.
2. He won't leave the TV set _________ supper's on the table.
3. Hong Zhanhui is really a kind ma, we should _____him.
4. There are too many students here, so I ____ them ____ six groups.
5. The doctor told him that he may take some fruits, ________ apples, bananas and oranges.
6. We are going to _______ those trees, because they made the vegetables stop growing.
7. Many animals are nearly ______, so we should protect them.
8. Li Dong doesn't like to speak __________.
9. He said he would __________ the chance to study abroad.
10. They usually have lunch at a restaurant, but they have their lunch at home __________.
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填空题

规定割让香港岛的是（）
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