为了评价实施改换水源降低水氟工程后的效果，在全国饮水型地方性_爱下问搜题

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问题单项选择题 A2型题

为了评价实施改换水源降低水氟工程后的效果，在全国饮水型地方性氟中毒流行严重的10省市，采用整群抽样调查的方法，共调查1758个改换水源的工程，约占全部改水工程的97%，选择1980年实施改换水源降氟工程后，在当地出生并饮用该水8年及以上的8～12岁儿童，调查其氟斑牙患病情况，该研究属于（）

A.队列研究

B.病例对照研究

C.临床试验

D.社区干预试验

E.生态学研究

答案

参考答案：E

阅读理解

阅读理解。

Dear Cindy,
     How's going with you? For me it's terrible. Three are too many rules in our school. It isn't fair. I have
to get up at five forty every morning.  I can't be late for running, I have to run at six thirty. I have to
practice English and Chinese every day. In the evening I can't watch TV or hang out with friends because
I have to do my homework. I have to go to bed before ten o'clock. What's more? We can't listen to
music or eat in the classroom. We even can't wear hats or have long hair. We have to wear school
uniforms every day. On weekends, I still have to stay at school on Saturday. Because I have to learn
science and math. Do you have lots of rules in your school? Are they fair?
                                                                                                                             Your friend,
                                                                                                                                Alex

1. Who is the letter from?

A. Cindy.
B. Alex.
C. Cindy's teacher.
D. Alex's teacher.

2. What time does Alex have to get up?

A. Five forty.
B. Six forty.
C. Five o'clock.
D. Six thirty.

3. What does Alex have to practice every day?

A. English.
B. Chinese.
C. French.
D. A and B.

4. Why does he stay at school on Saturday?

A. To hang out friends.
B. To learn math and science.
C. To listen to music.
D. To play soccer.

5. Why is Alex not so happy?

A. Because he can't wear school uniforms.
B. Because he has nothing to do at school.
C. Because there are so many rules in his school.
D. Because there are so many rules in his house.

单项选择题

女性，20岁，心悸，多汗1个月。体检发现血压160／80mmHg，心率110次／分，以下哪项处理正确（）

A.长期服用降压药

B.立即应用降压药，血压正常后停药

C.观察半年

D.间歇用药

E.查明原因