问题 单项选择题

在评价预防接种的效果时,下列哪个指标是评价流行病学效果的指标()

A.患病率

B.发病率

C.病死率

D.保护率

E.阳性率

答案

参考答案:D

写作题
据调查显示,目前许多中学生不重视课外阅读。请你根据下表内容写一篇短文,对这一现状进行分析并提出建议。
要点:
 
Reasons for not reading
1. too much homework
2. no habit of reading
3. spend time on TV or the Internet
  
Advantages of reading
1. learn more about the world
2. think better
3. make our life more colorful
……
Advice to teachers or students
……(至少一点)
注意:1. 不少于60词(开头已给出的内容不记入总词数);
2. 内容必须包括上表中的要点,可适当发挥;
3. 条理清楚、语句连贯;
4. 文中不得出现真实的地名、校名和人名。
At present only a few students do some reading after class. Here are several reasons.
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选择题