Now let's look ourselves as a species in rela...

Now let's look ourselves as a species in relation to ecosystem balance.Modern scientists believe that humankind, like other animals, evolved(进化) through millions of years of changes and adaptations to the environment and that our most direct evolutionary ancestor was probably an earlier species of the primate(monkey, ape) group. Despite this similarity with other creatures, however, the evolution of humankind differs from that of other species in one important and unique way.

In other species, evolution has led to specialization, both in the species abilities and in its place within the environmental structure. For example, the giraffe is much adapted to feeding on treetops, but it is also specialized and thus limited to feeding on trees and shrubs. Only with great difficulty can it bend down to graze on the ground. Similarly, the anteater is extremely well adapted to eating ants but is unable to catch or eat other animals. The same is true for countless other species.

For humankind it is opposite. Our evolution had led to a very generalized ability. Our highly developed intelligence and ability to make and handle tools mean that we can do almost anything. Humans evolved in such a way that we are able to move into every environment on Earth and even into space. No natural competitor offers great resistance, and other natural enemies such as disease have been controlled.

Said another way, we see in humankind a great imbalance between biological potential and environmental resistance. The result is the rapidly increasing world population, frequently referred to as the population explosion. Further, to support our growing population, natural ecosystems are being increasingly displaced by human habitations, agriculture, and other human supporting activities.

1.From the passage we can infer that in the course of evolution _______.

A. humankind is very important to earlier species, such as the primate group

B. human beings are limited by the environment while animals are not

C. human beings become more and more different from each other

D. humankind has experienced a generalization rather than specialization in ability

2.According to the passage, primate includes such animals as _______.

A. monkeys and anteaters                    B. tigers and apes

C. apes and monkeys                         D. monkeys and giraffes

3.According to the passage, evolution has made it possible for humans to _______.

A. increase the population

B. resist natural offers

C. go to the moon

D. cure all diseases

4.According to the author, imbalance between biological potential and environ mental resistance has resulted in _______.

A. the population explosion

B. the destruction of human habitations

C. the growth of natural ecosystem

D. the specialization of humans

高二英语阅读理解中等难度题查看答案及解析

Now let’s look ourselves as a species in relation to ecosystem balance.Modern scientists believe that humankind, like other animals, evolved(进化) through millions of years of changes and adaptations to the environment and that our most direct evolutionary ancestor was probably an earlier species of the primate(monkey, ape) group. Despite this similarity with other creatures, however, the evolution of humankind differs from that of other species in one important and unique way.

In other species, evolution has led to specialization, both in the species abilities and in its place within the environmental structure. For example, the giraffe is much adapted to feeding on treetops, but it is also specialized and thus limited to feeding on trees and shrubs. Only with great difficulty can it bend down to graze on the ground. Similarly, the anteater is extremely well adapted to eating ants but is unable to catch or eat other animals. The same is true for countless other species.

For humankind it is opposite. Our evolution had led to a very generalized ability. Our highly developed intelligence and ability to make and handle tools mean that we can do almost anything. Humans evolved in such a way that we are able to move into every environment on Earth and even into space. No natural competitor offers great resistance, and other natural enemies such as disease have been controlled.

Said another way, we see in humankind a great imbalance between biological potential and environmental resistance. The result is the rapidly increasing world population, frequently referred to as the population explosion. Further, to support our growing population, natural ecosystems are being increasingly displaced by human habitations, agriculture, and other human supporting activities.

1.From the passage we can infer that in the course of evolution _______.

A. humankind is very important to earlier species, such as the primate group

B. human beings are limited by the environment while animals are not

C. human beings become more and more different from each other

D. humankind has experienced a generalization rather than specialization in ability

2.According to the passage, primate includes such animals as _______.

A. monkeys and anteaters                                                 B. tigers and apes

C. apes and monkeys                                                           D. monkeys and giraffes

3.According to the passage, evolution has made it possible for humans to _______.

A. increase the population

B. resist natural offers

C. go to the moon

D. cure all diseases

4.According to the author, imbalance between biological potential and environ mental resistance has resulted in _______.

A. the population explosion

B. the destruction of human habitations

C. the growth of natural ecosystem

D. the specialization of humans

高二英语简单题查看答案及解析

Many species are in ______ danger of extinction now due to the foolish actions of ______ human race.

A. the; the　　　　　 B. 不填; the

C. the; 不填　　 　　 D. 不填; 不填

高二英语单项填空中等难度题查看答案及解析

— Did the door-keeper let you in?

— No. ____I tried to tell him I was your relative, he just didn’t believe me.

高二英语单项填空简单题查看答案及解析

He was charged with ______ robbery and now is being questioned in relation to it.

A. advised           B. attended         C. admitted         D. attempted

高二英语单项填空简单题查看答案及解析

Schools in the north tend to be better equipped, ______ those in the south are relatively poor.

A. as                       B. unless              C. when           D. while

高二英语单项填空简单题查看答案及解析

The book you want is not ___now. I will let you know as soon as it is returned to the library.

高二英语单项填空中等难度题查看答案及解析

Many of us see reading as an investment in ourselves, so it’s only natural that we want to learn something useful our efforts.

A. in view of　　 B. in response to

C. in parallel with　　 D. in return for

高二英语单项填空简单题查看答案及解析

Let’s observe another little scene, ________you might have in your new life to come.

A. what     B. as     C. where      D. that

高二英语单项填空中等难度题查看答案及解析

Sharks have lived in the oceans for over 450 million years. There are now about 360 species of sharks, whose size, behavior, and other characteristics differ widely.

Sharks range in size from the 0.1 meter long dwarf-dog shark to the 18-metre long whale shark — the world’s biggest fish. The whale shark, like two other large shark species — the basking shark and the megamouth shark — are harmless to people because they feed on plants and small aquatic animals.

Sharks have extremely sensitive sense organs. Some sharks can detect the scent(气味) of decaying fish or blood even when it is diluted(稀释) to only one part per million parts of seawater. They can probably hear underwater sounds that originate as far as 3 kilometers away and can tell the direction from which underwater sounds are coming.

Sharks are key predators(肉食动物) in the world’s oceans, helping control the numbers of many other ocean predators. Without sharks, the oceans would be overcrowded with dead and dying fish.

Every year, we catch and kill over 100 million sharks, mostly for food and for their fins. Dried shark fins are used to make shark fin soup, which makes a profit for the sellers. Other sharks are killed for sport and out of fear. Sharks are vulnerable to overfishing because it takes most species 10 to 15 years to begin reproducing and they produce only a few offspring.

Influenced by movies and popular novels, most people see sharks as people-eating monsters. This is far from the truth. Every year, a few types of sharks injure about 100 people worldwide and kill about 25. Most attacks are by great white sharks, which often feed on sea lions and other marine mammals. They sometimes mistake human swimmers for their normal prey, especially if they are wearing black wet suits.

If you are a typical ocean-goer, your chances of being killed by an unprovoked(无缘无故的) attack by a shark are about 1 in 100 million. You are more likely to be killed by a pig than by a shark.

Sharks help save human lives. In addition to providing people with food, they are helping us learn how to fight cancer, bacteria and viruses. Sharks are very healthy and have aging processes similar to ours. Their highly effective immune system allows wounds to heal quickly without becoming infected, and their blood is being studied in connection with AIDS research.

Sharks are among the few animals in the world that almost never get cancer and eye cataracts. Understanding why can help us improve human health. Chemicals extracted from shark cartilage(软骨) have killed cancerous tumors in laboratory animals, and these chemicals may someday help prolong our life.

Sharks are needed in the world’s ocean ecosystems. Although they don’t need us, we need them. We are much more dangerous to sharks than they are to us. For every shark that bites a person, we kill one million sharks.

1.Which statement best expresses the main idea of the article?

A. There are many different species of sharks, but only a few of them are dangerous to humans.

B. Sharks are important to the ocean ecosystem and they are a valuable resource for humans.

C. Although some sharks are dangerous to humans, they can help save human lives.

D. Sharks always eat small fishes and they are an essential part of the world’s oceans.

2.Which question is NOT answered in the article?

A. How long does a shark live?

B. How many people are killed by sharks each year?

C. Why are sharks important in medical research?

D. What do humans kill sharks for?

3.It can be inferred from the passage that ______________.

A. movies have given people the wrong impression of sharks

B. most sharks are dangerous to humans

C. sharks will attack anyone who is wearing black

D. it is very likely that ocean-goers will be killed by a shark

高二英语阅读理解中等难度题查看答案及解析