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March 25 is the 17th National Day of Education on the Safety of Elementary and Middle School Students. The theme (主题)of the day this year is to give students more knowledge about how to keep safe.

How can you keep yourselves safe? Here are some suggestions.

When there is a fire: Shout out “Fire”! Call 119! Try to find a safe exit and get away quickly. Don’t use a lift. Use a piece of cloth to cover your mouth and nose.

When there is an earthquake at school: Stay calm. Follow the teachers’ instructions. Quickly move under the desk. Don’t jump out of windows or run out.

When you are on the street: Wait for the green traffic light. Look left and right before crossing the street. Don’t run across the street.

When you are eating: Wash fruits and vegetables carefully before eating them. Check the expiration dates(保质期) of the food. Don’t eat the food if it looks or smells bad.

When you are at school: Take care not to fall down or hurt yourself. Don’t run, jump or push while going upstairs or downstairs. Take care of yourself all the time.

Suggestions on 1.

Situations

What you should do

What you shouldn’t do

Be on fire

Shout out “fire”! 2. 119! Find a safe exit. Get away quickly. Use a piece of cloth to cover your mouth and nose.

Take a lift.

Have an earthquake

Stay calm. Follow the teachers’ instructions.

Move quickly under the desk.

Jump 3. windows.

Run out.

Be on the street

Wait for the green traffic light. Look left and right before_crossing the street.

Run across the street.

While eating

Wash fruits and vegetables 4. .Check the expiration dates.

Eat bad food.

While at school

Look 5. yourself at any time.

Jump, run or push while going upstairs or downstairs.

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Have you ever wondered how and why a fall leaf changes color? We first have to understand what leaves are and what they do.

Plants are the world’s food factories. Plants take water from the ground and take CO2 from the air. Plants use sunlight to turn water and CO2 into glucose(葡萄糖). Glucose is a kind of sugar. Using it as food, plants get energy and grow. Plants using sunlight to turn water and CO2 into sugar is called photosynthesis(光合作用). ChlorophyII helps photosynthesis. It gives plants their green color.

As summer ends and autumn comes, the days get shorter and shorter, and trees "know" to begin getting ready for winter. During winter, there is not enough light or water for photosynthesis. Trees rest during this time and live on the food they store during the summer. They begin to shut down their food — making factories. As the green chlorophyII disappears from the leaves, we begin to see yellow and orange leaves. These colors have been in the leaves all the time. We just can’t see them in the summer, because they are covered up by the green chlorophyII.

The bright reds and purples we see in leaves are made mostly in autumn. In some trees, glucose is caught in the leaves after photosynthesis stops. Sunlight and the cool nights of autumn turn this glucose into a red color. The brown color of trees is made from waste left in the leaves. It is mixture(混合物) of all these things. It makes the beautiful leaves during autumn.

根据材料内容选择最佳答案。

1.The underline word "chlorophyII" in the passage means " " in Chinese.

A. 胡萝卜素 B. 叶绿素 C. 氯霉素 D.花青素

2.When they rest in winter, trees live on the food they store during the .

A. summer B. autumn C. winter D. spring

3.Plants use sunlight to turn into sugar.

A. water and chlorophyII

B. water and CO2

C. CO2 and glucose

D. water and glucose

4.Which of the following is NOT true according to the passage?

A. Glucose is a kind of sugar and plants use it as food for energy and growing.

B. Leaves turn red because sunlight and the cool nights of autumn turn glucose into a red color.

C. We can’t see yellow or orange leaves in summer because the two colors are not in leaves.

D. During winter, there is not enough light or water for photosynthesis.

5. What’s the main meaning of this passage?

A. What’s photosynthesis?

B. How and why leaves change colors?

C. Different kinds of leaves.

D. How the seasons change.

Americans with small families own a car. If both parents are working , they usually have two cars. When the family is larger, they will sell one of the cars and buy a van(住房汽车).

A small car can hold four persons and a large car can hold six persons but it is very crowded. A van can hold seven persons easily, so a family with three children can ask their grandparents to go on a holiday travel. They can all travel together.

Mr. Hagen and his wife had a third child last year. So they sold their second car and bought a van. They thought it would be more convenient for them to go out together.

Americans call vans motor homes. They always use them for holidays. When a family is traveling to the mountains or to the seaside, they can live in their motor home for a few days or weeks. All the members of a big family can enjoy a happier life when they are traveling together. That is why motor homes have become very popular.

1.Americans also call vans___________.

A. Motor cars B. Motor homes

C. Motorbikes D. motor trucks

2.A family with _________ usually has a van.

A. a baby

B. Much money

C. more than two children

D. interest in vans

3.Americans usually use motor homes to_________

A. Travel with all the family members for holidays

B. Do some shopping with all the family members

C. Visit their grandparents at weekends

D. Drive their children to school every day

4.Motor homes have become popular because________

A.they can take people to another city when people are free

B.They can let families have a happier life when they go out for their holidays

C.Some people think motor homes are cheap

D.Big families can put more things in motor homes

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