High in mountains, and deep in the forest, lives a lake with many plants and animals in and around her. The plants and animals have enough food and clean water to keep them healthy. The wind carries pure air, and the rain comes down clear and clean.

But recently, Lucy Lake and her friends haven’t been feeling very well. All the plants and animals get together to talk about the problem. “Why are we sick?” “What can we do?” ask all of them. No one has any answers.

Just then two hikers appear. The animals tell them about their problems. “Can you help us?” they ask. “Yes,” one hiker says. “I think it’s because of acid(酸) rain.”

“Acid rain comes from chemicals(化学物质) in the air. The pollution comes from factories, cars and trucks.”

“So, although I don’t want to, I help the pollution travel through the air!” says the wind. “And I carry it to the land!” cries the rain.

“If you can help us think of some solutions(解决方法), we will send a message to tell people how to clean up our environment,” one hiker says.

With the help of the plants and animals, the two hikers make a list of ideas for saving Lucy Lake and her friends.

Time passes, and the forest and lake begin to feel a little better.

The next time the hikers climb up the mountains to Lucy Lake, they smile at what they find. “We’re glad things have started to change,” one hiker says. “And we’re glad you helped us make a difference,” says the other.

The Science Museum in London

By Tony Smith

Welcome to the most friendly museum in London. In most museums, there is no shouting and no running and you must not touch anything. But the Science Museum is different….It is noisy! People talk about what they can see and do here, and there are some very noisy machines as well. If you want answers to all your questions about science, this is the right place for you.

I like to visit the rooms on the second and third floors. You can learn about communications and the environment as well as maths, physics and chemistry. For example, you can find out how people dig coal from the ground and use it to create energy. And in one room they even explain how X-rays let you see inside your body.

The Lauchpad on the third floor is the most popular room, and it is my favourite too because there are lots of physics experiments. For example, if you want to fill a bag with sand, you have to control a kind of truck on wheels and move it into the correct place. You can also find out how people travel into space and back again.

On the fourth and fifth floors, you can learn about what medicine was like in the past. If you compare the medicine of the past with the medicine of today, you will feel very lucky next time you visit a doctor!

The Science Museum is interesting for people of all ages. You can always find something new and have a wonderful time there. The museum is free to enter, so you can go in for a few minutes or stay all day. It is open daily from 10 a.m. to 6 p.m.. So if you ever go to London, make sure you visit the Science Museum. It is my favourite museum in the whole world!

Every school has r    56     for students to follow. However , some students may see the rules as a way which teachers control them in. Sometimes, they’re unhappy and even feel angry. Well, if you think your life is hard, you might think about the students in ancient times. For some of them, life was really hard. In the old days, people believed that teachers had to be very strict and had the right to punish the students. Parents didn’t mind if teachers punished their children when their children didn’t do w    57     they were told to do. Often, the s    58     a teacher was, the more parents thought he or she was a good teacher.

In fact, following school rules is very i    59    . For example, running in the hallway could cause a student to fall down. It may hurt him or a    60     person.F    61     the rules can also help the students in the classroom to learn without difficulty. In class, a teacher may ask students to raise their hands b    62     they speak. If someone speaks out of turn, other students might not be able to hear the teacher c    63    . School rules can help students prepare f    64     their own futures as well. When they grow up and go out on their own, they’ll soon find that they still need to follow rules. Rules m    65     the world much better. If there are no rules, life will be meaningless and in disorder.

66. 假如你是某学校学生李华，上周末你的父母去北京出差两天，你一个人在家。请根据下面提示，以 “Home Alone for the First Time” 为题，写一篇100词左右的文章，记录你独自在家的生活，可适当发挥。

Home Alone for the First Time