经食物传播的肠道传染病流行特点是A.有明显周期性变化 B.有明显季节性变化 C.停止

题型:单项选择题

问题:

经食物传播的肠道传染病流行特点是

A.有明显周期性变化

B.有明显季节性变化

C.停止食用污染食品发病缓慢平息

D.除哺乳婴儿外,任何年龄性别的人均可患病

E.可常年散在发病

考点:临床执业助理医师预防医学预防医学(八)
题型:单项选择题

阅读短文,选择正确答案。

     In the United States, headmasters and teachers discipline (惩罚) students in several ways. The teacher often

writes to or calls the students' parents. Sometimes students have to stay at school for one hour. If a student

behaves very badly, the headmaster can stop the student having classes. The student can't come to school for

one, two or three days. Mr. Lazarus, the headmaster of a middle school in Ohio, did not like to do so. When he

didn't let the students come to school, they were happy."A three-day holiday!" they thought.

     One day, a boy was in Mr. Lazarus' office. The boy was not behaving well in class. Mr. Lazarus telephoned

the boy's parents. "If you come to school with your son, I won't stop him having classes," he said. The boy's

father came to school and went with his son to every class. Other students looked at the boy and his father. The

boy was embarrassed. After that he behaved better. And, of course, other students behaved better, too. 

     Now headmasters all over the USA are trying Mr. Lazarus's idea. They too, think that students behave better

when parents come to school.

1. What does a headmaster usually do to the student if he behaves very badly? [ ]

A. He stops the student having classes for several days.

B. He makes the student stay at school for one hour.

C. He calls the student's parents.

2. When a student was stopped having classes for two or three days, he was ________. [ ]

A. happy

B. angry

C. worried

3. What did Mr. Lazarus do when his students were not behaving well in class? [ ]

A. Tried to talk to them.

B. Sent them home.

C. Telephoned their parents to come to school and go to classes with them.

4. Why did the other students behave better, too? [ ]

A. They didn't like to have classes with the boy's father.

B. They didn't want their parents to come to school.

C. They were afraid of teachers.

5. In the United States, a student will be _______ when his parents have classes with him. [ ]

A. happy

B. embarrassed

C. excited

题型:单项选择题
依照下面的句子,完成这一节小诗。(字数可略有增减,可不考虑押韵)
  我骄傲:我是中国人——
  黄土高原
  是我挺起的胸膛,
  珠穆朗玛是我高昂的头颅,
________________________________________________________
题型:单项选择题

光从()射入光疏介质。当入射角增大到某一角度,使折射角达到90°时,折射光完全消失,只剩下反射光,这种现象叫做()。

题型:单项选择题

影响水平能见度小于1.0km和需要记录最小能见度的天气现象分别有()种。

A.14、7

B.13、6

C.≥15、7

D.≥13、6

题型:单项选择题

当铸造应力超过金属的强度极限时,铸件就产生()

A.冷列

B.拉长

C.变形

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