- What did Mr. Smith do before he came to China?

- He ______ in a car factory.

A. works　　　　　 B. worked　　　　　 C. is working　　　 D. will work

Every time you turn on the television or take a ride in a car ,you could be adding to a problem called acid rain(酸雨). In this article, you’ll learn how acid is created, and how it affects us, and more importantly, what we all can do to prevent it.
How is acid rain created?
When people use fuels(燃料), such as coal and gasoline, poisonous gases are given off. When these gases mix with rain, acid rain forms. Many power stations burn fuels in order to create the electricity(电) that we use in our homes and offices every day. Cars and trucks also send these gases into the air when they burn gasoline .When rain mixes with these gases, harmful things called acids form. This is acid rain.
How does acid rain affect us?
Acid rain damages(毁坏)everything that it touches. It poisons our rivers, ponds, lakes, and oceans along with all the life in them. It pollutes our soil and crops, harms trees, and can even kill fish and plants. Acid rain also eats away at buildings.
How can we prevent acid rain?
We need to cut down on the pollution that gets into our air. Turn off lights, television, and other electrical appliances if you are not using them, Walk or take a bike whenever possible. If you are travelling a long distance, take a bus or train to save fuel.
As research shows, acid rain harms our environment. But people everywhere can take small steps now to help protect our environment for future generations.
【小题1】When power stations burn fuel, _______.

Many people like to travel by plane , but I don't like it because an airport(飞机场) is usually far from the city. You have to get early and wait for hours for the plane to take off and it is often late. You can’t open the windows. You can’t choose the food. Planes are fast, but they still take hours to go out the airport and into the city.

I like traveling by train. I think trains are safe. Train stations are usually in cities. When you are late for a train, you can catch another one. You can walk around in the train and open the windows. You can see many interesting things on your way. I know it takes a little more time.

I also like cars. You can start your journey when you want to, and you don’t need to get to train station or bus stop. Also you can carry many things with you in a car. But sometimes there are too many cars on the road.

1. Why do many people like to travel by plane?

      A. Because it’s fast.      

B. Because it’s safe

     C. Because you can walk around in the plane.

 D. Because it’s cheap.

2. Which is NOT the good thing about the train?

     A. It is safe.     

B. It takes a little more time.

     C. You can open the windows. 

 D. You can walk around in the train.

3. If you want to take a lot of things with you, what do you take to go out?

     A. A bus.     B. A car.    C. A train.     D. A bike

4. What is the bad thing about the car?

A. You needn’t go to a station.

B. You can start your journey when you want to.

C. There are too many cars on the road.

D. You needn’t go to a bus stop.

5. What does the writer think of the transportations?

A. He thinks it takes a lot of time to go to and get out of the airport to take the plane.

B. He likes to take a train because it takes a little more time.

C. He likes to take a car because he has a car.

D. He likes to take a plane because it’s fast.

Many people like to travel by plane , but I don't like it because an airport is usually far from  the city. You have to get there early and wait for hours for the plane to take off and it is often late. You can't open the windows. You can't choose the food. Planes are fast, but they still take hours  to go out of the airport and into the city.
I like traveling by train. I think trains  are safe. Railway stations  are usually in cities. When you are late for a train, you can catch another one. You can walk  around in the train and open the windows. You can see many interesting things on your way. I know it takes a little more time. I  also like cars. You can start your journey when you want to, and you don't need to get to a railway station or a bus stop. also you can carry many things with you in a car. But sometimes there are too many cars on the road.
【小题1】Why do many people like to travel by plane?