1 . About one million years ago, the Ice Age began. The Ice Age was a long period of time in which four great glaciers (冰川) pushed southward to cover almost all the upper half of North America, and then melted away. Each glacier was a thick sheet of ice and snow that spread out from a center near what is now Hudson Bay in Canada. The winters were long, and the cool summers were too short to melt much of the ice and snow, The ever - growing sheet built up to a thickness of two miles at its center.
As all glaciers do, these great glaciers slid. They pushed down giant trees in their paths and scraped (刮, 削) the earth bare of soil. Many animals moved farther south to escape. Others stayed and were destroyed.
When winters of little snow came, the summer suns shone into the edges to the ice sheets. As the glaciers melted, rocks, soil and other things that had mixed with the ice and snow were left. New hills, lakes and rivers were formed.
The last of the great glaciers began its melting about 11000 years ago. Its melting formed the Great Lakes. These lakes are today little changed from their early sizes and shapes. The largest of the North American river systems Was also influenced by the glaciers. This is the Mississippi - Missouri - Ohio system. These rivers were miles wide a first. Through the years they settle into their present channels.
1. The main idea of this passage is ________ .| A．the Ice Age was a long period of time |
| B．great glaciers covered North America many years ago |
| C．changes in climate helped to melt the glaciers |
| D．how glaciers changed North America |
| A．are two miles thick | B．form frozen lakes |
| C．are a million years old | D．move and slide |
| A．the sliding of glaciers are usually destructive |
| B．all glaciers in the world move southward |
| C．the Mississippi - Missouri - Ohio system is larger than it was before the ice Age |
| D．the Great Lakes are now smaller than they were before the ice Age |
| A．lakes | B．rivers | C．glaciers | D．systems |
2 . Rainforests are home to a rich variety of medicinal plants, food, birds and animals. Can you believe that a single bush（灌木丛）in the Amazon may have more species of ants than the whole of Britain! About 480 varieties of trees may be found in just one hectare of rainforest.
Rainforests are the lungs of the planet-storing vast quantities of carbon dioxide and producing a significant amount of the world's oxygen. Rainforests have their own perfect system for ensuring their own survival; the tall trees make a canopy（树冠层）of branches and leaves which protect themselves, smaller plants, and the forest animals from heavy rain, intense dry heat from the sun and strong winds.
Amazingly, the trees grow in such a way that their leaves and branches, although close together, never actually touch those of another tree. Scientists think this is the plants' way to prevent the spread of any tree diseases and make life more difficult for leaf-eating insects like caterpillars. To survive in the forest, animals must climb, jump or fly across the gaps. The ground floor of the forest is not all tangled leaves and bushes, like in films, but is actually fairly clear. It is where dead leaves turn into food for the trees and other forest life.
They are not called rainforests for nothing! Rainforests can generate 75%of their own rain. At least 80 inches of rain a year is normal-and in some areas there may be as much as 430 inches of rain annually. This is real rain-your umbrella may protect you in a shower, but it won't keep you dry if there is a full rainstorm. In just two hours, streams can rise ten to twenty feet. The humidity（湿气）of large rainforests contributes to the formation of rainclouds that may travel to other countries in need of rain.
1. What can we learn about rainforests from the first paragraph?| A．They produce oxygen. | B．They cover a vast area. |
| C．They are well managed. | D．They are rich in wildlife. |
| A．Heavy rains | B．Big trees. |
| C．Small plants. | D．Forest animals. |
| A．For more sunlight. | B．For more growing space. |
| C．For self-protection. | D．For the detection of insects. |
| A．Life-Giving Rainforests | B．The Law of the Jungle |
| C．Animals in the Amazon | D．Weather in Rainforests |
3 . Famous Modern Chinese Buildings
Beijing International Airport
The first place most visitors see when they arrive in China is Beijing International Airport. The airport was constructed in the 1950s. It has an indoor garden, a children’s playground, and over 70 food businesses in Terminal 3 alone.
Shanghai World Financial Center
Completed in 2008, SWFC took over 10 years to complete due to financial shortages and construction delays. Since its completion, it has won countless architectural awards.
Tourists are welcome at SWFC's viewing platform, which at 474 meters above ground is the worlds highest closed viewing platform.
The Water Cube
It was constructed for use during the Beijing 2008 Summer Olympics. Now visitors can express surprise at the architecture of the building. They can enjoy the indoor atmosphere as well.
Among the offerings of the Water Cube are a restaurant and bar, a shopping area, and Water World, a family water park
The Bird's Nest, Beijing
It was designed mainly for the 2008 Summer Olympics. It can hold up to 80,000 people and has been used for a winter theme park. Nowadays, its main income is as a tourist attraction. It draws more than 20,000 tourists every day.
National Center for the Performing Arts
It was completed in 2007. The building is surrounded by a man-made lake, requiring guests to enter via an underground hallway. It is home to an Opera Hall, Music Hall, and Theater.
1. Which of the following buildings was first constructed?| A．Beijing International Airport. | B．Shanghai World Financial Center. |
| C．The Water Cube. | D．The Birds Nest, Beijing. |
| A．It needed more construction workers. | B．It was short of money. |
| C．It added an extra viewing-platform. | D．It faced too much terrible weather. |
| A．By renting the winter theme park. | B．By increasing its opening time. |
| C．By charging tourists for admission fees. | D．By giving some live concerts. |
| A．Enjoy sports events. | B．Play musical instruments. |
| C．Attend science lectures. | D．Watch different performances. |
