单选题Some of the larger birds can remain stationary in the air for several minutes.（）A silentB motionlessC seatedD true

Scinentists jumped to the rescue with some distinctly shaky evidence to the effect that insects would eat us up if birds failed to control them。

Some people remain calm by ________ to wishful thinking or daydreaming.

A taking

B setting

C making

D resorting

---- Excuse me. Could you tell me ___________?

---- Yes, There is a video shop next to the tall building.

A. where can I buy some CDs B. where I can buy some CDs

C. when can I buy some CDs D. when I can buy some CDs

A、It can help a team to get larger and larger.

B、It can prevent a team from breaking a record.

C、It can help a team to increase the chances of winning.

D、It can change any team into a famous team.

Most animals have little connection with animals of different kind, unless they hunt them for food. Sometimes, however, two kinds of animals come together in a partnership ( 伙伴关系 ) which does good to both of them. You may have noticed some birds sitting on the backs of sheep. This is not because they want a ride, but because they find easy food in the parasites (寄生虫 ) on sheep. The sheep allow the birds to do so because they remove the cause of discomfort. So although they can manage without each other, they do better together.

Sometimes an animal has a plant partner. The relationship develops until the two partners cannot manage without each other. This is so in the corals ( 珊瑚 ) of the sea. In their skins they have tiny plants act as "dustman", taking some of the waste products form. the corals and giving in return oxygen which the animal needs to breathe. If the plants are killed, or are ever prevented from lighting so that they cannot live normally, the corals will die.

1、Some birds like to sit on a sheep because ( ).

A、they can eat its parasites

B、 they depend on the sheep for existence

C、 they enjoy traveling with the sheep

D、 they find the position most comfortable

2、The underlined word "they" in the last sentence of the first paragraph refers to ( ).

A、birds and parasites

B、birds and sheep

C、parasites and sheep

D、sheep, birds and parasites

3、What does the second paragraph mainly discuss? ( )

A、Some animals and plants depend on each other for existence.

B、 Some animals and plants develop their relationship easily.

C、 Some plants depend on each other for foo

D、 Some animals live better together.

4、What does this article talk about? ( )

A、Two kinds of animals for a partnership.

B、Most animals only have connection with animals.

C、The connection between the living things.

D、Corals have some connection with plants.

A The weight of the cargo on loading was supervised by the manager. ;

B But 15 tons of goods can’t simply disappear into thin air. ;

C I think there must be some misunderstanding.

Ventilation ().

A、is a system for moving fresh air

B、can cut indoor pollution to a safe level

C、can cause some diseases

D、is better done through air-conditioning

What is known about the influenza virus?

A. It was first found in a group of very old birds.

B. All the different strains can be found in wild birds.

C. It existed over 100 million years ago.

D. It can survive in many different places.

Air pollution

People and air pollution are often in the same places. This means that cities with large populations have the biggest problem of dirty air. Air pollution is caused by many different things. A major kind of air pollution is the gas from cars. Statistics(统计资料) show that 93 percent of all auto trips are within cities.

Another major kind of dirty air is the burning of coal and oil for energy. This energy is needed to make electricity. Of course, much more electricity is used in the city than in the county.

On the average, we throw away more rubbish than the year before. The burning of rubbish makes air pollution even worse. Many major industries are also responsible for the dirty air in the around cities. The fumes(烟)from iron, steel, chemical, and petrol production add particles(微粒)to the air.

The effects of air pollution range from mild headaches to death. The levels of pollution found in heavy traffic may cause headaches for loss of clear vision. Wherever coal and oil are used for fuel, fumes may kill trees and plants and cause metal to corrode(腐蚀). In some of the larger cities, these fumes endanger the lives of human beings by contributing to lung diseases and causing early death.

26. The key point of the passage is that().

A. the cause of air pollution is people

B. the causes and the effects of air pollution are both found in cities

C. the effects of air pollution range from headaches to death

27. What is the purpose of this passage?

A. to persuade people to stop polluting the air().

B. to tell the causes of air pollution

C. to tell why cities are bad places to live

28. Why is air pollution more grave in the city than in the country?().

A. Because there are larger populations in cities.

B. Because the air in the city is dirty.

C. Because there are much more gas fumes from cars and burning of coal and oil for energy in the city than in the country.

29. The fumes from coal and oil may cause metal().

A. to corrode

B. to twist

C. to turn black

30. In larger cities, the fumes from coal and oil may contribute to().

A. heart disease

B. loss of clear vision

C. lung diseases

Some birds will fly away to the south in winter, while _____ will stay with you.

A. another

B. the others

C. others

D. other ones