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Spring is usually prime food time for some 1,200 polar bears along Canada's Hudson Bay. Ea

ch year they plunder the bay's ice floes, smash open the snow caves of seals, and stuff themselves on seal pups. But in recent years the bears' feast has turned into slimmer pickings. Why?

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

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更多“Spring is usually prime food time for some 1,200 polar bears along Canada's Hudson Bay. Ea”相关的问题

第1题

tennis is usually regarded as a winter and spring sport. ()

tennis is usually regarded as a winter and spring sport. ()

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第2题

It usually drizzles in().

A、the spring

B、springs

C、spring

D、a spring

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第3题

Spring in East china usually () in about march.

A.sets

B.set

C.seting

D.seted

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第4题

People usually _______ spring with sunshine and flowers.A、regardB、imagineC、welcomeD、con

People usually _______ spring with sunshine and flowers.

A、regard

B、imagine

C、welcome

D、connect

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第5题

An ocean towing bridle whose legs are equal length, but too short, may ______.A.fail to pr

An ocean towing bridle whose legs are equal length, but too short, may ______.

A.fail to provide spring in the hawser

B.cause unequal distribution of the load to one leg

C.cause the bridle legs to jump clear of the chocks or fairleads

D.None of the above

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第6题

Chinese people legally enjoy over 115 days off including 104 days of weekends and 11 d
ays of festivals.China has seven legal holidays in a year, including New Year’s Day, Spring Festival, Qingming Festival, May Day, Dragon Boat Festival, Mid-Autumn Day and National Day.Employees have 5 to 15 days of paid annual leave.Students and teachers have summer and winter vacations for about three months.The summer vacation in China generally starts around July 1st and ends around August 31st, and the winter vacation usually falls on January or February according to the date of the Spring Festival.

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第7题

在这个举国同庆的除夕夜晚,我谨代表公司的全体同仁,感谢各位来宾光临我们的春节联欢晚会。可译为: a.On the occasion of this Chinese New Year’s Eve of national celebration, and on behalf of all my colleagues of the company, I wish to thank all the guests here for their gracious presence at this Spring Festival gathering. b.On the occasion of this Chinese New Year’s Eve of national celebration, and stand by all my colleagues of the company, I wish to thank all the guests here for their gracious pr
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第8题

Being blessed with a variety of tourist attractions and natural sceneries, Tianjin is
a wonderful place for sightseeing both for travelers from China and abroad.Facing the Bohai Sea, Tianjin possesses a semi-moist continental monsoon climate.It has four distinctive seasons and each season has its own beauty to explore.

Tianjin’s spring begins from late March to early May.It is pleasant and suitable for traveling.Taking a hike on Mount Panshan in Jixian County is a good choice in this season.Early April is also a good time for travelers to pay a visit to the ancient town of Yangliuqing.However, occasionally there may be windy days or even sandstorms.

Summer in Tianjin is usually from mid-May to the end of August when it is very hot and damp.The temperature can reach as high as 35°C.The rainy season from June to August generates 75% of the year’s total rainfall.July tends to be the wettest month in this city, but there are still lots of things to do for fun.Travelers can choose to go to the seaside or visit the biggest man-made port in China.It is located in the district of Tanggu, which is no more than one hour drive from downtown.As well, the annual Tianjin Beer Festival is held in July.

The best time to visit Tianjin is September and October, as autumn is very pleasant with a mild temperature, and it is the right time to enjoy the brilliant(灿烂的) red, yellow and green leaves on Huangyaguan Great Wall.

In November, Tianjin slowly turns to winter, and the first snow usually falls during this month.The average low and high temperatures are -2°C and 16°C, respectively.January can be rather chilly and accompanied by piercing winds at times.The maximum temperature is 6°C and it can get down to as low as -15°C.Winter in this city is very dry and windy.On sunny days, however, shopping will be an ideal choice for visitors, as the city is less crowded and attractive discounts are available.Foreigners are fond of Ancient Culture Street.There they can find a wide variety of cultural Chinese items, such as calligraphy brushes, tea pots and all kinds of traditional handicrafts.

1.What beautiful tourist attractions and natural sceneries are mentioned in the passage?

2.What time is the rainy season of Tianjin?

3.Where is the biggest man-made port in China located?

4.What is the ideal place for visitors to travel in autumn?

5.Which month is the coldest in Tianjin? What is the lowest temperature?

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第9题

Vegetable gardening is the relaxing art and science of turning a love for growing plants i
nto a meaningful activity. Having vegetables in the backyard makes home gardening appealing for many people. In addition, vegetable gardening provides exercise and fun for both urban and suburban families.

Vegetable gardeners agree that many home-grown vegetables are superior to those purchased from markets. From spring through late fall, a well-planned and well-kept garden can provide a supply of fresh vegetables, thus increasing the nutrition of the family diet.

Freezers make it possible to keep some of the vegetables to be enjoyed at a later date. Other vegetables can be stored for a few months in a cool area.

Although the money spent for a garden may be little, one cannot escape the fact that gardening requires hard work and time. Many of the gardening tasks must be performed at times that are most inconvenient. Not doing jobs that should be done on a regular basis may result in failure and a negative feeling toward gardening.

One should not plant a garden that is too large for him to care for. A small, well-kept garden is more enjoyable and profitable than a large neglected one. Vegetables do well in full sunlight and need at least five or six hours of sun during the middle of the day. Too much shading results in poor plants and few vegetables. If possible, the garden should be near the house, so the gardener can work in it whenever they are free.

Soils for vegetables should be easily broken up and porous (多孔的) for quick water drainage and good aeration(透气). Usually the home owner has little choice in the type he can choose.

Fortunately, many vegetables can be grown on poor soils if the soils are properly prepared.

Many people find home gardening______.

A.expensive and boring

B.interesting and enjoyable

C.time consuming and inconvenient

D.neither interesting nor enjoyable

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第10题

Spring comes. It is .()
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