问题 问答题

简述种群、物种和群落间的关系。

答案

参考答案:种群是同种生物的不同个体群、是构成物种的基本单位,也是构成群落的基本单位。任何一个种群在自然界都不能孤立存在,而是同其他物种的种群一起形成群落。每一个物种包括几个种群,并分别分布在不同的群落中,因此,每一个群落都含有几个属于不同物种的种群。群落就是在一定空间范围内的所有生物种群组成有一定结构和功能的有机整体。

阅读理解

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 magazines 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.

1. How often does Readers Digest come out in the USA? [ ]

A. Once a year.

B. Once a month.

C. Once a week.

D. Once a day.

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.

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

填空题