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 give off. When these gases mix with rain, acid rain forms. Many power stations burn fuels in order to creat 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,_______.

Spring is a good season to fly kites. You can fly your kites in the park, in the field or on the play ground. There are many different kinds of kites. Some look like birds; Some look like planes and some look like butterflies. People often fly kites on a sunny and windy day. And the best month for flying kites is March. How can we fly our kites in the sky. First, we run with our kites against the wind. Then when the kite can fly in the sky, you can just stay there with your string reel(线轴) in your hand. When the kite doesn’t fly in the sky, just adjust(调整) the string reel. The string on the reel must be very strong. If you want to fly kites very well, you should practice it more with your friends. Maybe you feel a little difficult at first, but if you fly kites often you will find it very easy and interesting. Flying kites is a very good activity in spring, and a lot of people like it.

1.Where can’t you fly your kites?

2.When do people often fly kites?

3.If the kite can’t fly well in the sky, what should we do?

4.What does the underlined word “against” mean?

5.Flying kites is a good sports in         .

When the traffic lights turn red, we will stop driving a car or crossing a street. Why is red used for traffic lights instead of other colors?

As we know, scattering (散射) happens when light goes through the air. For the same media(媒质), if the wavelength is long, the scattering will be short. If the wavelength is short, then the scattering will be long.

Of all lights we can see red has the longest wavelength, so the scattering is the weakest. That means the red light travels far. In fact, it travels farther on rainy days.

Using the red light can help drivers in farther areas sec the lights. It helps drivers stow down or stop in lime. If drivers don't see the red light until they are close, they may not be able to stop the car in time. An accident may happen Red can also excite people. We can act more quickly when we see the color red. In a word, red lights help drivers stop in time and help prevent accidents.

1. When the traffic lights turn ______, we will stop driving a car.

A. red    B green     C. yellow

2.According to the passage, the scattering of the red light is the _______.

A. longest    b. weakest       C. farthest

3. The underlined word "wavelength" means________ in Chinese.

A.波浪        B.光波      C.波长

4. What can the red light help drivers do?

A. It can help drivers in farther areas see the lights.

b. It can help drivers slow down or stop in time.

C. A and b

5.Which of the following is the best title?

A. Why do accidents happen

b. How does the red light travel

C. Why do we use red traffic lights

Wearing clothes is not just about fashion. We need clothes to stay warm or cool in different weather. I have three friends. They are from different places. And they like to wear different clothes.
Dave is from the UK. He likes rainy days, because rain makes the grass green. On a rainy day, he often wears his rain boots. He also likes his light blue umbrella.
Mona is from Australia. She likes sunny days. She likes to go to the beach. She often wears her beautiful skirt with her blouse.
Peter is from Canada. He likes snowy days. He likes to play with snow. He often wears his coat. He also likes to wear his scarf and gloves.
【小题1】People need clothes to stay         in different weather.
A. warm of cool         B. big or small         C. tall and short
【小题2】How many friends does the writer have?
A. One.                 B. Two.             C. Three.
【小题3】What weather does Dave like?
A. Rainy days.              B. Sunny days.      C. Snowy days.
【小题4】What clothes does Mona often wear?
A. Her jacket with her shorts
B. Her skirt with her blouse.
C. Her coat with her pants.
【小题5】Where is Peter from?
A. The UK.              B. Australia.           C. Canada.