问题 单项选择题 B1型题

由于流感病毒的变异引起流感流行属于()

A.在流行病学三角模型中,环境因素不变,病因比重增加

B.宿主因素发生变化,宿主比重增加

C.病因、宿主、环境三要素保持动态平衡

D.环境因素发生变化,导致病因比重增加

E.环境因素发生变化,导致宿主比重增加

答案

参考答案:A

单项选择题
阅读理解

第三部分:阅读理解.(共15小题:每小题2分,30分)

阅读下列短文,然后从各题所给的四个选项(A、B、C、D)中,选出最佳选项,并将该答案写在答卷上。

A

To most of us, school means classes, teachers, schedules, grades and tests. But for the children at Sudbury Valley School in Massachusetts, school is very different.

Firstly, there are no lessons. All the children, aged between 4 and 19, do whatever they want. There are no teachers, only “staff members”. The idea behind this is that you do not need to make children learn, because children want to learn anyway. “You do not need to say to a three-year-old, ‘Go explore your environment.’ You can’t stop them!” says Daniel Greenberg, a founder of the school. “But if you make children do what you want all day… they will lose all taste of learning.” At Sudbury Valley School, you will find children talking, reading, painting, cooking, working on computers, studying French, playing the piano, climbing trees, or just running around.Two boys spent three years just fishing!

The other way that Sudbury Valley School is different is that the children can decide the rules. Every week, there is a school meeting where both children and staff have one vote each—even the four-year-olds. They decide the school rules, how to spend the school budget (预算,经费), and even which staff they want and do not want anymore.

When the school first opened in 1968, people said it would never work. But today, the school has 200 students, and 80% of its students go on to college. Even the two boys who went fishing all the time have successful careers today. One of them is a musician and the other is a computer scientist.

56. What is the main idea of the article?

A. An unusual school.           B. Children’s hobbies.   

C. A school without teachers  D. Education in the US.

57. What does the school believe?

A. Teachers cannot teach children well.

B. Children learn best when they do what they want to do.

C. Learning is for adults—children should only play.

D. Children should only learn about one thing at a time.

58 What does Daniel Greenberg say about three-year-olds?

A. They love learning.         

B. They are very naughty.

C. They want to be outside all the time.      

D. They are too young to learn anything.

59. Who has the most power in the school meeting?

A. The older children have more power than the younger children.

B.A child has more power than an adult.

C. The younger children have more power than the older children.

D. Everybody has equal power.