We get energy from the foods we eat.Our food supplies energy to keep our organs work

ion or decline of populations of large and well-known animals.Many animal species have become extinct since the 1700’s, among them the California grizzly bear, the dodo, and the passenger pigeon.Hundreds of other animal species are threatened.In North America, endangered species include the black-footed ferret, the California condor, the desert tortoise, and the whooping crane.

Most species in danger of extinction anywhere in the world are suffering from the intrusion (侵入) of human beings.The Asian elephant, for example, has become an endangered species due to the expansion of the human population throughout its range in southern Asia.In Africa, the African elephants are being killed off for their tusks.Monkeys and other primates throughout the world are threatened by hunting, capture for medical use, and the destruction of their habitats.And the rhinoceroses, lions, and other large mammals of the African savanna (grassy plains with scattered trees) compete for land and life with some of the most rapidly growing human populations in the world.

The loss of biological diversity is most severe, however, in the tropical rain forests.The forests of the tropics are particularly vulnerable to disturbance because the soils have a low capacity for retaining nutrients.Most of the forests’ nutrient elements are held in the tissues of plants.When loggers and farmers destroy existing plant cover, the nutrients are washed from the land into streams, and the land itself becomes less able to support life.Destruction of these forests destroys the habitat of hundreds, sometimes thousands, of species from such creatures as the howler monkey and indigo macaw, to less visible species of plants, insects, and microbes, many of which are not yet known to science.

1.The author points out that species extinction ().

A.is most noticeable in North America

B.is mainly taking place among large animals

C.quickened with industrialization of the society

D.never took place before the 1700’s

2.Which of the following is NOT mentioned with regard to human intrusion?

A.Elephants are killed off for their tusks

B.Some primates are hunted for medical use

C.Growing human population results in the competition for land and life among animals

D.Men live increasingly on animals as their source of food.

3.The chief cause of the gradual disappearance of biological diversity is ().

A.human cruelty

B.human interference

C.the increase of human population

D.the disappearance of the forests

4.In tropical forests，().

A.animals live a hard life due to competition

B.a lot of species die out for lack of food

C.rains constitute the major threat to species

D.a greater number of animals are yet to be known

5.It can be inferred that species extinction ().

A.proceeds of a faster rate than noticeable

B.is the worst among well-known animals

C.is the most severe in Africa

D.is chiefly due to competition among species

(英语作文)

时间：本月10日早晨8点

地点：图书馆前

事由：国庆庆祝活动

相关人员：全体学生

具体：1.校长简要介绍安排

2.学生参观博物馆，并在中心广场看演出

3.10:30举行篮球比赛

前受雇于彼得逊出版社。我离开现工作岗位的唯一理由是，目前的职位对我没有发展途。我擅长写作和编辑，所以一直想从事编辑工作。[注意：必须包括收信人的称谓，写信日期 (2004年6月)，收信人( 杰克 )的签名等基本格式。]

(英语作文) 现在有不少学生希望能够出国留学：

1. 有人认为出国留学很有必要

2. 有人认为没有必要

3. 我的观点

(英语作文)1. 最近几年，很多省份的高中语文教材都删除了很多经典作品

2. 有人认为应该删除这些经典作品

3. 我的看法

(英语作文)1.介绍你的一位中学老师;

2.说明为什么这位老师受学生欢迎。

(英语作文)现在有不少年轻人喜欢闪婚：

1. 对这种做法有人表示支持

2. 有人并不赞成

3. 我的观点

(英语作文)1.介绍你对健康与财富之间关系的看法;

2.简述你持有以上看法的理由。

(英语作文)1. 在国庆黄金周，许多中国的风景区提高票价

2. 人们对此看法不一

3. 我的看法

(英语作文)1. 大学生享有很大的自由

2. 过多的自由对大学生来说有利有弊

3. 我的观点