Polar explorers have to be extremely ______ to endure the abominable climate and other har

A.rough

B.dull

C.tough

D.rigid

A.when

B.what

C.lest

D.that

A、Prince of Egypt

B、Monster House

C、Polar Express

D、Beauty and Beast

And with water present the【C3】______of finding some sort of life on Mars are【C4】______brighter.

This is the view of 40【C5】______all over the world who have been analyzing【C6】______of pictures and other scientific【C7】______obtained by robot explorers in the sixties and seventies.

To begin with, scientists thought the Red Planet was as【C8】______as the Moon with dust storms swirling over vast sandy【C9】______. But now the picture is very different with mountains and valleys carved by【C10】______glaciers and torrential rivers rushing and rumbling deep underground.

In a report on the【C11】______of the Martian pictures Dr. Michael Car of the U.S. Geological Survey comments, "I am【C12】______there's lots of water on Mars." Any surface water will be in the【C13】______of ice. But it could【C14】______explorers having to take so much fresh【C15】______with them.

The report says【C16】______Mars probably had a warmer climate in ages【C17】______due to its axis having been more steeply tilted towards the Sun.

【C18】______convincing signs of plant or animal life have been【C19】______by instruments soft. landed on Mars,【C20】______only the immediate vicinity of landing vehicles could be examined.

【C1】

A．expected

B．hoped

C．required

D．eager

阅读材料，回答题。

The top of the world is a wonderland. In winter, the temperature often fails to -30~F and the sun never rises. The ocean is surrounded by frozen ground. There are few people or trees, but to polar bears, the Arctic(北极) is home.

Polar bears have thick fur, big paws and other features that make them well prepared for life in their tough environment. In fact, they need the Arctic sea ice for survival. But climate change is causing larger and larger areas of summer sea ice to melt(融化). Experts say that if warming pat-terns continue, the Arctic could be free of summer sea ice by 2050. That may cause two-thirds of the word&39; s 20,000 polar bears to be gone by then too.

Polar bears can&39; t survive for long on land. Seals are their main source of food. The only place where polar bears can hunt seals is on the ice. Although these bears are strong swimmers, they are no match for lighming swift seals in the water. A polar bear has brilliantly clever strategies to overcome this disadvantage. In winter the bear waits motionless beside a seal&39; s breathing hole, which is a narrow tunnel through the ice. Often many hours pass before the seal comes up for air and the bear kills it with a powerful blow of its paw. In summer, the polar bears that live on land eat very little and wait for the sea ice to return.

With the sea ice forming later in the year and melting earlier, polar bears do not have enough opportunity to hunt and eat. Less sea ice makes it harder for the bears to catch the seals. The bears must swim longer distances between ice packs(大片浮冰), and they can&39; t always make it.. The ice is also getting thinner. These conditions can cause polar-bear cubs to become separated :from their mothers, who provide them with food.

Steven Amstrup is the chief scientist of Polar Bear International. The group aims to save the bears and their home. "The more people who see polar bears and understand their difficult situations, the better the chance we&39; 11 alter our warming path in time to save them," he says.

Which is the best title for the passage？ 查看材料

A.Climate Change in the Arctic

B.How to Protect the Environment

C.The Arctic Is Home to Polar Bears

D.Polar Bears in Danger

Temperatures at Hudson Bay have risen by one half degree Fahrenheit every decade since 1950. Winter ice on the bay melts three weeks earlier than it did just 25 years ago, which means three fewer weeks of polar bear mealtime. Result: Polar bears are 10 percent thinner and produce 10 percent fewer cubs than they did 20 years ago. And though climatologists hotly debate the causes behind Earth's Arctic meltdown, "these changes are startling and unexpected,' says James McCarthy, co-leader of the United Nations Intergovernmental Panel on Climate Change.

The plight of polar bears is just the tip to the iceberg when it comes to mounting evidence of global warming. "There's definitely a stark contrast with the way things were at the start of the 20th century," says atmospheric scientist Leonard Druyan, of Columbia University. Recent data show the volume of Arctic sea ice has shrunk 20 percent since the 1950s; glaciers around the world are melting at rapidly increasing rates. Rivers and lakes in North America, Asia, and Europe now freeze about nine days later and thaw 10 days earlier than they did a century ago.

Most scientists believe the only effective strategy to halt global warming is to drastically reduce emissions of powerful air pollutants like carbon dioxide, which accounts for two-thirds of all greenhouse gases. In the last 150 years, the surging use of fossil fuels coal, oil, and natural gas -- has released 270 billion tons of carbon into the air in the form. of carbon dioxide. Fortunately, oceans, plants, and soils absorb more than half of all atmospheric carbon dioxide -- without them world temperatures might have already soared at an alarming rate.

By saying "Spring is usually prime food time for 1,200 polar bears"？ (Line I, Para. 1), the author means that ______.

A．spring is usually a good time for polar bears to carry out their mating rituals

B．the polar bears usually eat a lot in the spring

C．spring is generally a good time to hunt polar bears

D．polar bears usually hibernate in the spring

As temperatures rise and the polar ice caps melt, the race is 11 to unlock the treasures of the Arctic.

This region is thought to contain one quarter of the world's untapped oil and gas 12 , and there's stiff competition 13 them. America, Canada, Denmark and Norway have all staked territorial claims in the Arctic, and 14 has Russia.

Three years ago, a Russian 15 planted a titanium flag 16 the ocean floor 17 the North Pole. It was a symbol of Moscow's 18 to protect what it sees as its national interest.

In Moscow this week scientists, businessmen and politicians 19 Arctic nations will discuss co-operation, but they're also expected to push their countries' 20 in the region.

11. A. in B. at C. on D. off

12. A. sources B. reserves C. stores D. savings

13. A. in B. at C. as D. for

14. A. as B. like C.so D. such

15. A. trip B. journey C. expedition D. mission

16. A. in B. at C. for D. on

17. A. beneath B. down C. low D. into

18. A. determination B. faith C. courage D. bravery

19. A. away B. off C. from D. towards

20. A. speech B. claims C. assertion D. accounts

In modem Western society, environment has begun to condition technology in new ways, although admittedly more indirectly, The safety and quality of the environment and public perceptions of it have begun to translate into presidential politics and congressional mandates to regulatory agencies to protect or enhance environmental quality or safety, occasionally even at the cost of some perturbation of the tech-economic status-quo. In France, Italy, and recently the United States, political parties have been formed, organized around a complex of technology / environment issues. In general, in the last fifteen years, the gradual development of broad-based environmental awareness, the lobbying and litigious activities of environmental interest groups, and guidelines issued and reinforced by the EPA (Environmental Protection Agency) in response to congressional mandates have markedly increased the heed paid to the environment by many corporations in going about their technological activities. Both research and development priorities and capital investment programs of the corporations have been affected by this.

Which of the following statements is TRUE？

A．Environment enables man to adapt successfully to new technology.

B．Technologies enable man to adapt successfully to his environment.

C．The development of technologies depends solely on the natural environment.

D．Lack of technologies to cope with the environment is caused by lack of natural resources.

Life is everywhere around us. It is evident in the huming of 【1】______

insects, the singing of birds, the rustlings of small animals in the

underbrush. It exists in the icy polar regions and in patched deserts.【2】______

It is present from the sea's sunlit surface to its darkest depths. High

in the atmosphere tiny creatures float about. Beneath our feet untold

trillion of microorganisms are 【3】______

on work in the soil, making it fertile for the growing of green 【4】______

plants, which sustain the other forms of life. 【5】______

Earth is packed with life so abundant and varied as to

staggering the imagination. How did it all start？ This planet of ours【6】______

and all inhabitants—how did they come to be here？ More 【7】______

particularly, how did humankind get started？ Did we evolve from

apelike animals？ And were we created？ Just how did we get here？ 【8】______

And what does the answer infer for the future？ Questions like these【9】______

have been around for a long time and they still unanswered in the 【10】______

minds of many.

【M1】

A.be allowed

B.allowed

C.are allowed

D.allowing