As is known________ us, the actress is known________ her excellent acting

    A. for; as   B. to; for      C. as; for   D. to; as

Have you ever noticed the colour of the water in a river or stream after a heavy rainfall? What do you think caused this change in colour? It is soil that has been washed into the river from the riverbank or from t}le nearby fields．

Components of Soft

Soil is made up of a number of layers（层），each having its own distinctive colour and texture．The upper layer is known as the litter．It acts like a blanket．limiting temperature changes and reducing water loss．The topsoil layer is made up of small particles of rock mixed with rotten plant and animal matter called humus（腐殖质），which is black and gives the topsoil its dark colour．This layer is usually rich in nutrients，oxygen，and water．Below the topsoil is the subsoil，a layer that contains more stones mixed with only small amounts of organic matter．This layer is lighter in colour because of the lack of humus．Beneath the soil lies a layer of bedrock．

Soil forms from the bottom up．Over time bedrock is attacked by rain, wind，frost, and snow．It is gradually broken down into smaller particles in a process called weathering．Plants begin to grow，and rotten materials enrich the topsoil．Most of the soil in Eastern Canada．for example．Was formed from weathered rock that was exposed when the ice disappeared l2．000 years ag0．

Water Beneath the Soil

Surface water collects and flows above the ground in lakes．ponds．and rivers．Once in the soil or rock，it is called groundwater．Gravity pulls groundwater through the soil in a process called percolation（渗透）．Eventually the water reaches a layer called the water table．Under this is bedrock through which water cannot percolate．

As water percolates downward，it dissolves organic matter and minerals from the soil and carries them to deeper layers．This causes a serious problem because plants require these nutrients for growth.

Soil pH

Soil can be acidic．neutral．or basic．The pH of the soil is determined by the nature of the rock

from which it was formed．and by the nature of t}le plants that grow and rot in it．

The acidity of rain and snow can lower the pH of the groundwater that enters the soil．By burning fossil fuels such as coal，oil and gasoline，humans have been contributing to higher levels of acidity in many soils．When fossil fuels are burned．gases are released into the air and then fall back to earth as acid rain．Acid soil increases出e problem of carrying nutrients to lower soil levels．As nutrients are removed，soil is less fertile．Plants grow more slowly in acidic soil，and also become easily attacked by diseases．

1.The layer of soil that provides necessary nutrients for plant growth is called．

A．1itter    B．topsoil    C．humus D．subsoil

2.According to the text．which of the following is NOT true?

A．Soil forms from weathered rock on the earth surface．

B．The deeper layer of soil is darker in colour than t}le surface soil．

C．Air pollution is partially responsible for acid soil．

D．Groundwater tends to carry away nutrients for plant growth．

3.We can infer from the passage that the water table lies       ．

A．between the topsoil layer and the subsoil layer

B．in the subsoil layer above bedrock

C．between the subsoil layer and bedrock

D．in the bedrock layer beneath the subsoil

4.The underlined word “dissolve” is used to express the idea that organic matter and minerals from soil are          ．

A．rushed away into the river

B．cleaned and purified by water

C．destroyed and carried away by water

D．mixed with water and become part of it

        is known to everybody that the moon travels round the earth once every month.

        A．It                                B．As                              C．That                          D．Which

Zhai Zhigang is known          the world          a hero          

his walk in space.

A. as, as, for          B. to, as, for     C. to, as, on     D. in, for, as

Sri Lanka is known as the “Pearl of the Indian Ocean”, and it is easy to see why. This little country never fails to please visitors.

Arrive

The national airline is Sri Lankan Airlines, which flies from Colombo to London and a couple of other European cities. The country’s main airport is Colombo Bandaranaike, located 29km north of the capital city.

Why now?

    The best time to visit Sri Lanka’s southern beaches is from November to April. So by going early in the season, you’ll get the best weather. Also in November, Deepavali, known as “Diwali” or the “Festival of Lights”, is Sri Lanka’s main religious festival, celebrated throughout the country.

See

    There is plenty to see in Sri Lanka. The ancient capital cities of Polonnaruwa and Anuradhapura are worth seeing, and so are many outstanding ruins. Other mustsees are the rock fortress (要塞) of Sigiriya, towering over the jungle as far as the eye can see, and Dambulla’s cave temple, the country’s largest and best preserved. Both are UNESCO World Heritage (遗产) Sites. Kandy is a picture-like town, which was the last stronghold of the Kandyan Kings. Today it is a cultural relic centre where age-old customs, arts, and crafts remain.

Do

    Sri Lanka owns about 1,600km of beautiful palm-shaded beaches as well as warm, pure seas and colourful coral reefs. You can explore the underwater world, and surfing and diving are available too. Away from the shore, wildlife is a big draw for Sri Lanka, and Yala National Park is one of the best places in the world to see wild animals including leopards (豹) and elephants.

Taste

Sri Lanka is celebrated for its excellent food, with a particular emphasis on fresh fruit and vegetables on menus everywhere. Fish and seafood are a big part of the local diet.

Did you know?

Sri Lanka is known for its tea, but it is also the world’s largest producer and exporter of cinnamon(肉桂).

1.Which of the following is a cultural relic centre of Sri Lanka?

   A. Anuradhapura.            B. Kandy.             C. Colombo.          D. Polonnaruwa.

2.If you want to know something about “Diwali”, you’d better go there in           .

   A. November.      B. May.            C. September.            D. October.  

3.We can learn from the passage that Sri Lanka           .

    A. is in the Pacific Ocean                         B. is famous for its excellent food

  C. is the world’s largest producer of tea           D. has only flights to London

4.The author wrote the article in order to           .

    A. let readers know what is famous in Sri Lanka

    B. introduce the picturesque landscape of Sri Lanka

   C. let people get more travel information about Sri Lanka

    D. make Sri Lanka well known throughout the world