____________ from other continents for millio...

_____ from other continents for millions of year, Australia has many plants and animals not found in any other country in the world.

A. Being separated　　　　 B. Having been separated

C. Having separated　　　　 D. To be separated

高二英语单项填空中等难度题查看答案及解析

_______ from other continents for millions of years, Australia has many plants and animals not found in any other country in the world.

A．Being separated                        B．Having separated

C．Having been separated                   D．To be separated

高二英语单项填空中等难度题查看答案及解析

_________ from other continents for millions of years, Australia has many plants and animals not ________ in any other country in the world.

A.Having divided, to be found B.Having been separated, found

C.Have been separated, found D.Divided, finding

高二英语单项填空中等难度题查看答案及解析

____________ from other continents for millions of years,Austrailia has many plants and animals not found in any other country in the world.

A Being separated B Having separated C Having been separated D To be separated

高二英语单项填空中等难度题查看答案及解析

Every year, hundreds of millions of Monarch Butterflies (黑脉金斑蝶) from Canada and the United States journey as far as 2, 500 miles to the forests of Michoacan, Mexico, a place which has the world’s largest insect migration. It’s such a breathtaking sight, but as always, human greed is threatening to destroy it.

The Monarch Butterflies start to arrive in Michoacan in late October to make their winter home in the trees high up in the mountains of the natural reserve. Once there, they gather together in large masses. These masses often become so heavy that they cause tree branches to bend or even break. But there’s a purpose of all these massing - it allows the butterflies to survive in the low nighttime temperatures at these high altitudes.

The Michoacan Monarch Butterfly Sanctuary (保护区) is most impressive during the months of February and March, just before the winged insects begin their long journey home.

Mexico’s Butterfly Forest is a shelter protected by law, and one of the country’s most popular sights, but that hasn’t stopped people from slowly but steadily destroying it.

Illegal woodcutting in the heart of the Monarch Butterfly Biosphere Reserve has been a longstanding problem, but criminals are rarely brought to justice. They are often set free after paying some money.

Just last month, an even greater threat rose in Michoacan’s butterfly home. The country’s largest mining corporation gained the right to reopen an old mine in the heart of the monarch reserve. Experts believe that if the mine is reopened, it will likely spell the end of this magical place.

And as if all this wasn’t bad enough, the increasing use of herbicides (除草剂) in the American corn belt has led to the decrease of a plant which is essential to the monarchs’ development from egg into butterfly.

1.When do the Monarch Butterflies begin to fly back to Canada?

A.In January. B.After March. C.In October. D.In December.

2.What does the underlined word “it” in Paragraph 2 refer to?

A.The weather. B.The reserve. C.The massing. D.The forest.

3.What can we know about the protection of Monarch Butterflies in Mexico?

A.It is very satisfying.

B.It should be strengthened.

C.It cost the government a lot.

D.It has saved many butterflies.

4.What can we infer from the last two paragraphs?

A.Monarch Butterflies have a worrying future.

B.America has many mines waiting for exploration.

C.Monarch Butterflies live in the centre of an old mine.

D.The use of herbicides will let Monarch Butterflies lay fewer eggs.

高二英语阅读理解中等难度题查看答案及解析

The natural beauty of Jiuzhaigou ________ millions of tourists from all over the world every year.

A．catches        B．attracts        C．reminds        D．seizes

高二英语单项填空中等难度题查看答案及解析

For hundreds of millions of years, turtles (海龟) have struggled out of the sea to lay their eggs on sandy beaches, long before there were nature documentaries to celebrate them, or GPS satellites and marine biologists to track them, or volunteers to hand-carry the hatchlings (幼龟) down to the water’s edge lest (for fear that) they become disoriented by headlights and crawl towards a motel parking lot instead. A formidable wall of bureaucracy has been erected to protect their prime nesting on the Atlantic coastlines. With all that attention paid to them, you’d think these creatures would at least have the gratitude not to go extinct (die out).

But Nature is indifferent to human notions of fairness, and a report by the Fish and Wildlife Service showed a worrisome drop in the populations of several species of North Atlantic turtles, notably loggerheads, which can grow to as much as 400 pounds. The South Florida nesting population, the largest, has declined by 50% in the last decade, according to Elizabeth Griffin, a marine biologist with the environmental group Oceana. The figures prompted Oceana to petition the government to upgrade the level of protection for the North Atlantic loggerheads from “threatened” to “endangered”— meaning they are in danger of disappearing without additional help.

Which raises the obvious question: what else do these turtles want from us, anyway? It turns out, according to Griffin, that while we have done a good job of protecting the turtles for the weeks they spend on land (as egg-laying females, as eggs and as hatchlings), we have neglected the years spend in the ocean. “The threat is from commercial fishing,” says Griffin. Trawlers (which drag large nets through the water and along the ocean floor) and longline fishers (which can deploy thousands of hooks on lines that can stretch for miles) take a heavy toll on turtles.

Of course, like every other environmental issue today, this is playing out against the background of global warming and human interference with natural ecosystems. The narrow strips of beach on which the turtles lay their eggs are being squeezed on one side by development and on the other by the threat of rising sea levels as the oceans warm. Ultimately we must get a handle on those issues as well, or a creature that outlived the dinosaurs (恐龙) will meet its end at the hands of humans, leaving our descendants to wonder how creature so ugly could have won so much affection.

1.We can learn from the first paragraph that ________.

A．human activities have changed the way turtles survive

B．efforts have been made to protect turtles from dying out

C．government bureaucracy has contributed to turtles’ extinction

D．marine biologists are looking for the secret of turtles’ reproduction

2.What does the author mean by “Nature is indifferent to human notions of fairness” (Line 1, Para. 2)?

A．Nature is quite fair regarding the survival of turtles.

B．Turtles are by nature indifferent to human activities.

C．The course of nature will not be changed by human interference.

D．The turtle population has decreased in spite of human protection.

3.What constitutes a major threat to the survival of turtles according to Elizabeth Griffin?

A．Their inadequate food supply.

B．Unregulated commercial fishing.

C．Their lower reproductively ability.

D．Contamination(pollution) of sea water

4.How does global warming affect the survival of turtles?

A．It threatens the sandy beaches on which they lay eggs.

B．The changing climate makes it difficult for their eggs to hatch.

C．The rising sea levels make it harder for their hatchlings to grow.

D．It takes them longer to adapt to the high beach temperature.

高二英语阅读理解中等难度题查看答案及解析

Have you seen Jurassic Park? In this film, scientists use DNA kept for tens of millions of years to clone dinosaurs. They find trouble, however, when they realize that the cloned creatures are smarter and more dangerous than expected. That’s nothing more than a fiction.

But could we really clone endangered animals?

To date, the most successful attempt to do so was the cloning of a gaur, a rare ox-like animal from southeast Asia. Scientists used a cow to bring the cloned baby gaur, named Noah. Two days after birth, however, Noah died from a common bacterial infection. Other endangered species that may be cloned include the African bongo antelope (羚羊), the Sumatran tiger, the cheetah (猎豹), and the giant panda.

Next, could we really clone extinct animals?

In theory? Yes. To do this, you need a well-kept source of DNA from the extinct animals such as wool mammoth (毛象), Tasmanian tiger, or even dinosaur, and a closely related species, still living, which could serve as a surrogate mother.

In reality? Probably not. On the one hand, it’s not likely that extinct animals’ DNA could survive undamaged for such a long time. Cloning such extinct animals as wool mammoth, Tasmanian tiger, or dinosaur is much more difficult due to the lack of properly well-preserved DNA. On the other hand, for example, a gaur can have a cow as a surrogate mother, definitely not a monkey. But what about an extinct animal as unique as the panda? What species could possibly serve as a surrogate mother?

Cloning presents many exciting possibilities. However, even if extinct animals were brought back, they could not survive in today’s world. Not only do most extinct animals have no habitat to love in, but the other plants and animals they depended on for food may also be gone as well.

1. It can be learned from the text that ________.

A. the gaur is an extinct species

B. the gaur lives in Asia and is endangered

C. scientists have cloned the African bongo antelope

D. both the cheetah and the giant panda live in Asia

2.The underlined words “a surrogate mother” probably refer to a female who ______.

A. gives birth to a baby of its own                 B. cannot give birth to a baby

C. gives birth to a baby for another female             D. provides DNA

3.The difficulty in cloning an extinct species is the lack of ______.

A. both the well-preserved DNA and a surrogate mother

B. both the habitat to live in and the well-preserved DNA

C. both the well-preserved DNA and plants to live on

D. both the habitat to live in and plants to live on

4.In the author’s opinion, it is possible that ______.

A. all the extinct species may be cloned

B. extinct species may be cloned and easily survive

C. a gaur can have a monkey as a surrogate mother

D. some extinct species may be cloned, but not survive

高二英语阅读理解困难题查看答案及解析

Have you seen Jurassic Park? In this film, scientists use DNA kept for tens of millions of years to clone dinosaurs. They find trouble, however, when they realize that the cloned creatures are smarter and more dangerous than expected. That’s nothing more than a fiction.

But could we really clone endangered animals?

To date, the most successful attempt to do so was the cloning of a gaur, a rare ox-like animal from southeast Asia. Scientists used a cow to bring the cloned baby gaur, named Noah. Two days after birth, however, Noah died from a common bacterial infection. Other endangered species that may be cloned include the African bongo antelope (邦戈羚羊), the Sumatran tiger, the cheetah (猎豹), and the giant panda.     Next, could we really clone extinct animals?

In theory? Yes. To do this, you need a well-kept source of DNA from the extinct animals such as wool mammoth (毛象), Tasmanian tiger, or even dinosaur, and a closely related species, still living, which could serve as a surrogate mother.

In reality? Probably not. On the one hand, it’s not likely that extinct animals’ DNA could survive undamaged for such a long time. Cloning extinct animals as wool mammoth, Tasmanian tiger, or dinosaur is much more difficult due to the lack of properly well-preserved DNA. On the other hand, for example, a gaur can have a cow as a surrogate mother, definitely not a monkey. But what about an extinct animals as unique as the panda? What species could possibly serve as a surrogate mother?

Cloning presents many exciting possibilities. However, even if extinct animals are brought back, they could not survive in today’s world. Not only do most extinct animals have no habitat to love in, but the other plants and animals they depended on for food may also be gone as well.

1. It can be learned from the text that ________.

A. scientists have cloned the African bongo antelope

B. both the cheetah and the giant panda live in Asia

C. the gaur lives in Asia and is endangered

D. the gaur is an extinct species

2. The underlined words “a surrogate mother” probably refer to a female who -----

A. contributes its eggs to another female   B. gives birth to a baby for another female

C. gives birth to a baby of its own        D. cannot give birth to a baby

3. The difficulty in cloning an extinct species is the lack of ______.

A. both the well-preserved DNA and plants to live on

B. both the habitat to live in and the well-preserved DNA

C. both habitat to live in and plants to live on

D. both the well-preserved DNA and a surrogate mother

4. In the author’s opinion, it is possible that ______.

A. some extinct species may be cloned, but not survive

B. extinct species may be cloned and easily survive

C. a gaur can have a monkey as a surrogate mother

D. all the extinct species may be cloned

5．Today , have scientists  cloned  dinosaus?

A .Yes    B .No    C .A lot  D.Only one.

高二英语阅读理解简单题查看答案及解析

Have you seen Jurassic Park? In this film, scientists use DNA kept for tens of millions of years to clone dinosaurs. They find trouble, however, when they realize that the cloned creatures are smarter and more dangerous than expected. That’s nothing more than a fiction.

But could we really clone endangered animals?

To date, the most successful attempt to do so was the cloning of a gaur, a rare ox-like animal from southeast Asia. Scientists used a cow to bring the cloned baby gaur, named Noah. Two days after birth, however, Noah died from a common bacterial infection. Other endangered species that may be cloned include the African bongo antelope (邦戈羚羊), the Sumatran tiger, the cheetah (猎豹), and the giant panda. Next, could we really clone extinct animals?

In theory? Yes. To do this, you need a well-kept source of DNA from the extinct animals such as wool mammoth (毛象), Tasmanian tiger, or even dinosaur, and a closely related species, still living, which could serve as a surrogate mother.

In reality? Probably not. On the one hand, it’s not likely that extinct animals’ DNA could survive undamaged for such a long time. Cloning extinct animals as wool mammoth, Tasmanian tiger, or dinosaur is much more difficult due to the lack of properly well-preserved DNA. On the other hand, for example, a gaur can have a cow as a surrogate mother, definitely not a monkey. But what about an extinct animal as unique as the panda? What species could possibly serve as a surrogate mother?

Cloning presents many exciting possibilities. However, even if extinct animals are brought back, they could not survive in today’s world. Not only do most extinct animals have no habitat to live in, but the other plants and animals they depended on for food may also be gone as well.

1. It can be learned from the passage that ________.

A. scientists have cloned the African bongo antelope

B. both the cheetah and the giant panda live in Asia

C. the gaur lives in Asia and is endangered

D. the gaur is an extinct species

2.The underlined words “a surrogate mother” probably refer to a female who __________.

A. contributes its eggs to another female

B. gives birth to a baby for another female

C. gives birth to a baby of its own

D. cannot give birth to a baby

3.The difficulty in cloning an extinct species is the lack of ______.

A. both the well-preserved DNA and plants to live on

B. both the habitat to live in and the well-preserved DNA

C. both habitat to live in and plants to live on

D. both the well-preserved DNA and a surrogate mother

4. In the author’s opinion, it is possible that ______.

A. some extinct species may be cloned, but not survive　　

B. extinct species may be cloned and easily survive

C. a gaur can have a monkey as a surrogate mother

D. all the extinct species may be cloned

5.Which of the following statements is true according the passage?

A. Jurassic Park is a cloned animal.

B. The cloned creatures are the same as the real one.

C. We could clone extinct animals in reality.

D. We could clone extinct animals in theory.

高二英语阅读理解中等难度题查看答案及解析