---Could you please provide us ______ some information about the students’ health ?

---Of course, it’s my pleasure.

　 A. to　　　　　　 B. of　　　　 　　 C. from　　　　 D. with

Put 2 February in your diary! It is World Wetlands Day! It marks the date that the

Convention(公约) on Wetlands was signed(签署)in1971.This special day was first celebrated in 1997 and it is celebrated every year.

　 The celebration is a call for action. It is a way to show people how important and

useful the wetlands are for people. On World Wetlands Day, people around the world take

part in many wetlands activities. People take trips to the local wetlands. There are talks

about how important the wetlands are. People get together to clean up their local wetlands

Children draw pictures to advertise the day. People also compete(比赛)in boat races.

　 The World Wetlands Day is important! If there are no wetlands, there will be no water for anyone in the future. Wetlands help protect nature and resources(资源)like fresh water. Already, more than 10000 million people in the world do not have fresh water.

　 Many people do not know how important the wetlands are. They can understand why an

elephant or a tiger is important because they are big, beautiful animals. It is much harder for

them to understand how important the animals in the wetlands are. These small animals,

such as frogs and snails, play a very important part in keeping the balance of nature.

　 All plants and animals are part of the food chain(链).If the small wetlands animals

die, some animals in the food chain will have nothing to eat. They will also die. People

need the wetlands to keep the balance of nature in the world. If we do not protect nature

today，it will be gone tomorrow.

46. What should you put in your diary?

　 A. Some frogs.

　 B. The date of World Wetlands Day.

　 C. 1971

　 D. Any special day.

47. Where do people celebrate World Wetlands Day?

　 A. All over the world.　　　　　　　　　　　 B. In ships

　 C. At home.　　　　　　　　　　　　　　　 D. In their own way.

48. Which of the following sentences is NOT true?

　 A. People celebrate World Wetlands Day by taking part in competitions.

　 B. People celebrate World Wetlands Day by taking hips to local wetlands.

　 C. People celebrate World Wetlands Day by listening to talks about the wetlands.

　 D. People celebrate World Wetlands Day by talking about the weather.

49. Why are small animals important?

　 A. They are part of the balance of nature and the food chain.

　 B. They are beautiful.

　 C. Bigger animals are eaten by them

　 D. Without them, there may be no water.

50. Which of the following might be the best title of the article?

　 A. Wetlands Are Important

　 B. Small Animals Are Also Important

　 C. World Wetlands Day

　 D. Food Chain

—Wow! What a lovely e-dog! Is it yours?

—Yes, it’s ______. My father bought it for me yesterday.

A. my　　　　　　 B. yours　　　　　 C. mine　　　　 D. your

1 

Three kids have been learning chemistry for only a few months. But they have already begun to challenge (挑战) a world famous scientist!

Li Weichi, Huang Runling, and Xiao Yan are from Zhongshan Huaqiao Middle School in Guangdong. They have just found a red cabbage that could be a new kind of acid-base indicator (酸碱指示剂). They want it to take the place of litmus (石蕊) paper.

"We've learnt to think of and ask questions about life by ourselves," said Li, "We work well with each other."

British scientist Robert Boyle discovered the use of litmus paper over 300 years ago. Now it is used widely in experiments all over the world.

But when the kids did some experiments in class last winter, they saw that the litmus paper didn’t turn very blue with base matter. It's hard to get a clear result.

Will there be a better indicator than litmus paper? The three kids decided to try and find out!

How? They went to collect over 40 plants in parks, gardens and markets. Then they ground (研磨) leaves, flowers and stems (茎) to get the pigments (色素) from them.

The kids mixed pigments with acid and base. They spent months watching carefully to see which paper showed the best color change. They decided it was the litmus paper!

"It's our first scientific journey, Huang said, "But it makes me want to try harder."

1.Whom did the three kids want to challenge?

A. Their chemistry teacher.

B. Their headmaster.

C. Robert Boyle

D. Thomas Edison

2.From the text, a red cabbage is a kind of ____.

A. plant　　B. animal　　C. paper　　D. liquid

3.What is widely used as the acid-base indicator now?

A. red cabbage              B. litmus paper

C. any plant                D. any flower 

4.The story mainly tells us ____.

A. how to make litmus paper

B. about the three kids' spirit

C. scientists were wrong

D. the kids are heroes