静脉血栓形成习惯上分成A.原发性血栓和继发性血栓形成B.外周静脉血栓和中心静脉血栓形

y interesting things to see and do. You can go to different kinds of museums, plays and films. You can also buy things from all over the world.

But there are serious problems in big cities too. It's expensive to live there, and there are too many people in some places in big cities. Every year many people move to the cities to find jobs, to study at good schools and receive good medical care (医学救护). But sometimes these people cannot find work or good places to live in. Also it is hard to keep the cities safe and clean.

In big cities people can______.

A．go to different kinds of museums

B．see all kinds of plays and films

C．A and B

看图，回答问题。How many things can you find in this picture What are they __________________________看图，回答问题。 How many things can you find in this picture What are they ______________________________________________

Where can you buy things from all over the world in big cities？

In ______.

y interesting things to see and to do. You can go to different kinds of museums, plays and films. You can also go shopping to buy things from all over the world. But there are serious problems in big cities too. The cost of living is high, and there are too many people in some of big cities. Every year many people move to the cities because there are some chances to find jobs, to study at good schools, and to receive good medical care. But sometimes these people cannot find work or a good place to live in. Also, too many people in a small space make it hard to keep the cities safe and clean.

Some people enjoy living in big cities. Others do not. Before people move to big cities, they should think about the problems of living there.

Which is the best title(题目)for this passage？

A．Big cities.

B．New York, London, and Paris.

C．Exciting Places in Big Cities.

D．Serious Problems in Big Cities.

y interesting things to see and to do. You can go to different kinds of museums, plays and films. You can also go shopping to buy things from all over the world. But there are serious problems in big cities too. The cost of living is high, and there are too many people in some of big cities. Every year many people move to the cities because there are some chances to find jobs, to study at good schools, and to receive good medical care. But sometimes these people cannot find work or a good place to live in. Also, too many people in a small space make it hard to keep the cities safe and clean.

Some people enjoy living in big cities. Others do not. Before people move to big cities, they should think about the problems of living there.

Which is the best title(题目)for this passage？

A．Big cities.

B．New York, London, and Paris.

C．Exciting Places in Big Cities.

D．Serious Problems in Big Cities.

Woman: It seems that you enjoy doing so many things at the same time.

Man: It's not that I like that, but that I have too many iron in the fire.

Woman: Haven't felt that you have bitten more than you can chew？ If I were you I would concentrate on finishing doing one thing before starting another.

Man: Things are not that simple. In many cases things come to you in company.

Question: What can we know from the conversation？

A．The man is very capable and energetic.

B．The man doesn't have a focus of the things he is doing.

C．The man hates doing too many things at the same time.

D．The man can not but do more than one thing at the same time.

Nowadays many big cities in the world ______ (不得不遭受交通堵塞之苦).

n do to catch up. (翻译)

, what about you？ Do you want to live in the big city or countryside？ Tell your reasons.