Polar bears live in environments too cold for...

Polar bears live in environments too cold for most1.(animal).For much of the year,they live and hunt on the 2.(freeze) Arctic sea ice.Nature has prepared them for the cold conditions.But nothing has prepared the bears for the danger3.threatens the only home they know.

The polar bears' world is melting.Studies show that the polar ice4.(reduce) by 9.8% every 10 years since l978.Now about 20,000 to 25,000 polar bears live in the Arctic.Polar bears depend on the sea ice for their5. (survive)."The sea ice is more6.just this platform that the bears walk over,"says Andrew Derocher,a scientist who studies North American polar bear populations."Without7.,they can't exist."

Some melting and refreezing of the polar ice is8.(nature).But in a warmer world,these cycles speed up,and bears have9.(little) time to hunt.Normally,they have three months in the spring when they gain more weight.The extra fat is used10.(late),when the bears are not actively hunting.

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Polar bears are suffering in a　 1.(warm) world.

Polar bears live in environments too cold for most animals.2.much of the year, they live and hunt on the frozen Arctic sea ice. Nature has prepared 3.for the cold conditions. But nothing has prepared the bears for the danger that 4. (threat)the only home they know.

The polar bears’ world is melting. Studies show that the polar ice has reduced by 9.8% every 10 years 5. 1978. Now about 20,000 to 25,000 polar bears live in the Arctic. Polar bears depend on the sea ice for their 6. (survive). “The sea ice is more than just this platform that the bears walk over,” says Andrew Derocher, 7. scientist who studies North American polar bear populations. “8. it, they can’t exist.”

Some melting and refreezing of the polar ice is natural. 9. in a warmer world, these cycles speed up, and bears have less time to hunt. Normally, they have three months in the spring when they gain more weight. The extra fat is used later,  10. the bears are not actively hunting.

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Polar bears are suffering in a much 1. (warm) world.

Polar bears live in environments too cold for most animals. During much of the year, they live and hunt on the frozen Arctic sea ice. Nature has 2. （prepare）them for the cold conditions. But nothing has prepared the bears for the danger 3. threatens the only home they know.

The polar bears’ world is melting. Studies show that the amount of the polar ice 4.（have）decreased by 9.8% every 10 years since 1978. Now about 20,000 to 25,000 polar bears live in the Arctic. Polar bears rely 5.the sea ice for their survival. “The sea ice is more 6. just this platform that the bears walk over,” says Andrew Derocher, 7. scientist who studies North American polar bear populations. “8. it, they can’t exist.”

Some melting and refreezing of the polar ice is natural. But in a warmer world, these cycles speed up, and bears have less time 9. (hunt). Normally, they have three months in the spring when they gain more weight. The extra fat is used later, when the bears are not 10.

(active) hunting.

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Polar bears are suffering in a1. (warm) world than ever before.

Polar bears live in environments too cold for most animals. For much of the year, 2.live and hunt on the frozen Arctic sea ice. Nature has prepared them for the cold conditions. But nothing has prepared the bears for the danger threatening the only home3.they know.

The polar bears’ world is melting. Studies show that the polar ice4.(reduce) by 9.8% every 10 years since 1978. Now about 20,000 to 25,000 polar bears live in the Arctic. Polar bears depend on the sea ice for their5. (survive). “The sea ice is more than just this platform that the bears walk over.” says Andrew Derocher, 6.scientist who studies North American polar bear populations. “7.it, they can’t exist.”

Some melting and refreezing of the polar ice is natural. 8.in a warmer world, these cycles speed up, and bears have less time9.(hunt). Normally, they have three months in the spring when they gain more weight. The extra fat is used later, 10. the bears are not actively hunting.

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Polar bears are suffering in a 1. (warm) world than ever before.

Polar bears live in environments too cold for most animals. 2. much of the year, they live and hunt on the frozen Arctic sea ice. Nature has prepared  3.  for the cold conditions. But nothing has prepared the bears for the danger that 4.(threat) the only home they know.

The polar bears’ world is melting. Studies show that the polar ice has reduced by 9.8% every 10 years 5.1978. Now about 20,000 to 25,000 polar bears live in the Arctic. Polar bears depend on the sea ice for their 6. (survive). “The sea ice is more than just this platform that the bears walk over,” says Andrew Derocher ,  7. scientist who studies North American polar bear populations. “  8. it, they can’t exist.”

Some melting and refreezing of the polar ice is natural. 9.  in a warmer world, these cycles speed up, and bears have less time to hunt. Normally, they have three months in the spring when they gain more weight. The extra fat is used later,  10. the bears are not actively hunting.

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Polar bears are one of the most popular animals for people. Polar bears are different from every other bear in the world. This is because polar bears have white fur. However, there are many facts about polar bears that people might not be aware of .

The skin of polar bears is black, which according to thinkquest.org　 allows them to absorb more heat from the sun. Polar bear fur is transparent , because it is made up of hollow guard hairs. Loc.gov explains that the reason polar bears display white fur is that when the sun hits the fur ,the hollow spaces in the hair scatter the light. Since none of the light is absorbed, the light reflected back appears white to human eyes.

Polar bears’ conservation status is considered close to extinction. Global warming is considered the main cause of the decline in polar population. Polar bears use ice floats to hunt for their food. However, these ice floats are melting so polar bears are starting to drown in the search for food ,and the food is becoming more difficult to get. Contrary to popular belief, polar bears do not eat penguins ,because polar bears are not found in the Antarctic region of the world. Polar bears are only found around the Arctic Circle. Polar bears do not drink water. They get all the water they need from the prey they eat.

FES. Gov specifies that polar bears are considered the largest land carnivores(食肉动物) in the world. The polar bear weight ranges between 700--1,500 pounds. Since the polar bear habitat is melting away, their main evolutionary advantages are fading. Polar bears are not able to use their camouflage(伪装) to find prey in habitats not covered with snow. Polar bears do not hibernate(冬眠). However, when the weather gets uncomfortable, or mothers give birth, polar bears will dig themselves a hidden home.

What can we do to help save the polar bears? We can donate to organizations like the World Wildlife Fund, reduce our carbon footprint, and send letters to politicians explaining to them that we need to set up more preserves to help save the polar bear habitat.

1.What do we know about the fur of the polar bears?

A. It absorbs more heat from the sun.

B. It is black and hollow.

C. Light can pass through it.

D. It is white actually.

2.What does “main evolutionary advantages” in Paragraph 4 refer　 to？

A. Hibernation habit　　 B. The function of their fur

C. Eating meat　　 D. Their weight

3.What do we know from the passage?

A. Polar bears face danger due to the melting of ice floats.

B. The biggest polar bears weigh about 1,000 pounds.

C. Polar bears never hibernate and do not need water.

D. Polar bears are the largest carnivores in the world.

4.Which of the following ways is NOT the measure used to protect polar bears according to the passage?

A. Donating to wildlife conservation organizations.

B. Trying our best to reduce greenhouse gases.

C. Writing letters to make people protect polar bears.

D. Setting up more polar bear conservation organizations.

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Polar bears live      on sea ice, which they use as a platform for hunting seals.

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Polar bears live________ on sea ice, which they use as a platform for hunting seals.

A．most B．almost   C．nearly   D．mostly

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Starving polar bears are eating one another in the Arctic. Flowers are blooming too soon and die. The ice caps are melting so fast that rising water levels will threaten coastal towns along Florida within several decades. These are just a few examples of the terrible consequences of climate change supported by a new analysis in Nature.

In the past three decades, average global temperatures have risen about 0. 6°C and are projected to jump by about 1. 7°C by the end of the century, says Cynthia Rosenzweig, who leads the Climate Impacts Group at NASA’s Goddard Institute for Space Studies at Columbia University in New York. “We’ve already seen that a relatively low amount of warming,” she says, “can lead to a broad range of changes. ”

The unnatural warming caused by man-made greenhouse gases, especially carbon dioxide produced by cars and coal-powered plants, brings trouble for entire ecosystems. In North America alone, scientists have identified 89 species of plants, such as the American holly that have flowered earlier in the spring. In Spain, apple trees bloom 35 days ahead of schedule in response to the higher temperatures. Other wildlife, like the insects that use certain plants for food and the birds that feed on the insects, must then move forward their seasonal stirrings(萌动) and mating（交配） patterns to survive.

To try to follow this time shift, some birds such as robins, the classic symbol of winter’s thaw(解冻时期), are returning to Colorado from their migrations some two weeks earlier than in years past. All these changes can throw a food chain in disorder. Some bird species that arrive before the insects reappear may starve to death.

“Around the world, plants and animals are waking up to an earlier alarm clock than they used to,” says Terry Root, a biologist from Stanford University.

1.The underlined word “projected”(in Paragraph 2) probably means “____”.

2.According to the third paragraph, as a result of climate change ____ .

3.What can we know about robins according to the passage?

4.What would be the best title for the passage?

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Forest are amazing and so are the animals that live in them. We enjoy watching TV shows about bears, bats or monkeys. We know a lot about their lives: how they find food or what they do at different times of the year. But what about smaller animals that are more difficult to see or film?

Many small animals that live in forests are very important for the soil. A French scientist, Francois Xavier Joly, is studying one of them — the millipede(千足虫).

The importance of leaves

When the leaves begin to die in fall, they turn from green to yellow and fall from the trees. As they decompose on the ground, nutrients(营养物质) are returned to the soil and carbon dioxide to the air. Life in the forest needs these nutrients. Without them, plants could not grow and there would be no food for animals such as the millipede.

Food on the forest floor

Some living things, like mushrooms, break the leaves into smaller pieces and eat them. In a few months there is nothing left of them. But for mushrooms, not all trees are the same. Mushrooms prefer some types of leaves to others. This means that some leaves take much longer to be broken down than others. Sometimes it takes years. So what happens to these? This is where the millipede can help.

More on the menu

The millipede also likes leaves and it eats any type. But when it has finished, it produces waste. This waste then becomes the food of mushrooms. When mushrooms eat leaves they choose only certain types but when they eat waste, they will eat any kind. This is how the millipede turns dead leaves into food for others and helps life continue.

So next time you are walking through a forest, remember that something may be having a meal right under your feet.

1.According to the passage, what can we learn about the millipede?

A. It can often be seen on TV shows.

B. It mostly feeds on the nutrients in the soil.

C. It is too small to be noticed by people.

D. It lives under mushrooms in the forest.

2.What does the underlined word "decompose" in Paragraph 3 mean?

A. Break down.

B. Dry up.

C. Dig in.

D. Make out.

3.What does the author want to tell us by mentioning mushrooms?

A. The millipede eats mushrooms in the forest.

B. The millipede helps to provide food for mushrooms.

C. Mushrooms play an important part in helping millipedes out.

D. Mushrooms decide what types of leaves the millipede will eat.

4.According to the author, the millipede is ________.

A. poisonous

B. rare

C. unimportant

D. amazing

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