问题 单项选择题

经空气传播的传染病的流行特征是

A.季节性升高,一般多见于冬春季

B.在未接种人群中,常呈周期性发病

C.如果疾病的潜伏期短,易感人群集中,容易引起爆发

D.受人口密度、居住条件等影响

E.以上均是

答案

参考答案:E

解析:经空气传播的传染病大多有季节性升高的特点,一般多见于冬春季节。在未经免疫预防的人群中,发病可呈现周期性升高。人口密度与居住条件是影响空气传播的主要因素。如果疾病的潜伏期短,易感人群集中,容易引起爆发。

阅读理解

Reader’s Digest is a monthly magazine. Before the 1980s, it belonged to a privately held company, which was started in 1922 by Lila Bell Wallace and Dewitt Wallace. This magazine is small and easy to carry, just half the size of most American magazines, which caused a phrase in 2005, “America in your pocket.” It is the best selling magazine in the USA. At present, its circulation(发行量) in the USA has reached 10 million copies and the number of the readers there is 38 million. Its global circulation outside the USA has reached 40 million people throughout more than 70 countries in 21 languages.

This magazine’s focus(焦点) is not news but more of cultural views because the editors think people now can get timely news from somewhere else. They hope this magazine can give readers something that is about special personal experiences, something the readers can share with their families. In different countries, this magazine provides a window to the world for the local readers. Some parts of the magazine are about the local customs and interests of the local readers. The other parts give the local readers information from all over the world.

This magazine actually used to be a family business until the Wallaces died in the 1980s. Because they had no children, there was no one to take over the company. Sixteen years ago, this company went public and became a public company.

小题1:How often does Reader’s Digest come out in the USA?

A.Once a year.

B.Once a month.

C.Once a week.

D.Once a day.小题2:What’s the number of the readers of this magazine all over the world?

A.38 million.

B.40 million.

C.78 million.

D.108 million.小题3:This magazine’s focus includes the following topics except _________.

A.something about the timely news

B.some special personal experiences

C.some information from all over the world

D.the local customs and interests of the local readers

单项选择题