The word “day” has two meanings. When we talk about the number of days in a year, we are using “day” to mean 24 hours. But when we talk about day and night, we are using “day” to mean the time between sunrise and sunset. Since the earth looks like a ball, the sun can shine on only half of it at a time. Always one half of the earth is having day and the other half night. A place is moved from day into night and from night into day over and over by the spinning（旋转）of the earth. At the equator（赤道）day and night are sometimes the same length（长度）. They are each twelve hours long. The sun rises at 6 o'clock in the morning and sets at 6 o'clock in the evening. For six months the North Pole（北极）is tilted（倾斜）toward the sun. In those months the Northern Hemisphere（半球）gets more hours of sunlight than the Southern Hemisphere（半球）. Days are longer than nights. South of the equator nights are longer than days. For the other six months the North Pole is tilted away from the sun. Then the Southern Hemisphere gets more sunlight. Days are longer than nights. North of the equator nights are longer than days. Winter is the season of long nights. Summer is the season of long days.

    In most parts of the world, many students help their schools make less pollution. They join environment clubs. In an environment club, people work together to make our environment clean.

    Here are some things students often do.

    No-garbage lunches. How many lunch bags do you throw away after lunch? Environment clubs ask students to bring their lunches in bags that can be used again. Every week they will choose the classes that make the least garbage and report them to the whole school.

    No-car day. On a no-car day, nobody comes to school in a car including the students and the teachers. Cars give pollution to us, so remember：

    Walk, jump, bike, or run!

    Use your legs! It's lots of fun!

    Turn off the water! Do you know that some toilets can waste twenty to forty cubic meters of water an hour? In a year, that would fill in a small river. In the environment clubs, students mend those broken toilets.

    We love our environment. Let's work together to make it better.

    Different weather makes people feel different. It influences health, intelligence(智力) and feelings.

    In August, is very hot and wet in the southern part of the United States, People there have heart trouble and other kinds of health problems during this month. In the Northeast and the Middle West, it is very hot at some times and very cold at other times. People in these states have more heart trouble after the weather changes in February or March.

    The weather can also influence intelligence. For example, in a scientific report, IQ (智商) of a group of students was very high when a very strong wind came, but after the strong wind, their IQ was 10% below. The wind can help people have more intelligence. Very hot weather, on the other hand, can make it lower. Students in many schools of the United States often get worse on exams in the hot months of the year (July and August).

    Weather also has a strong influence on people's feelings. Winter may be a bad time for thin people. They usually feel cold during these months. They might feel unhappy during cold weather. But fat people may have a hard time in hot summer. At about 18℃, people become stronger.

    Low air pressure may make people forgetful. People leave more bags on buses and in shops on low-pressure days. There is a "good weather" for health. People feel best at a temperature of about 18℃.

    Are you feeling sad, tired, forgetful, or unhappy may be the weather's problem today?

As students, what do you usually do in your life?{#blank#}1{#/blank#} Luckily, here is some advice for you to make it easy.{#blank#}2{#/blank#}

Most middle school students have two or three hours of homework every day. It is a good idea to make some kinds of homework plans(计划), especially(尤其) if you want to do sports or other activities after school.

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A bedroom, study or any quiet place is good for you to do your homework. But don't study on your comfortable bed, or you might fall asleep there.

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It's not good for students to study for long, so have some rest and you can learn better.

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Sometimes you study so hard, but some subjects are still too difficult. You can ask teachers and classmates for help.

 Do you like science? If you do, you should meet Ms. Frizzle, the science teacher from The Magic(神奇的) School Bus book series(系列)! Ms. Frizzle has a magic school bus. This bus can become small and go into plants and people's body. It can also travel into space or turn into a submarine to go under the sea.

 When Ms. Frizzle drives the Magic School Bus fast, something special(特别的) is going to happen. She likes to take students on great study trips on the bus. Students can learn about the earth, the sea, the water and everything by seeing and doing! Ms. Frizzle's favourite saying is," The best way to know is to do." Her classes are always wild(狂野的), but also a lot of fun.

 When you read The Magic School Bus books, you can learn a lot about science!

Hello, everyone. My name is Betty Smith. Betty is my 1 name and Smith is my family name. You can call(称呼) 2 Betty. I'm from America, 3 I'm in Beijing with my dad and mum now. 

I'm a 4 in Beijing No. 2 Middle School and I'm in Class 4 Grade 

7. There are 24 boys and 22 girls in my 5 . My classmates are all 6 to me and we are good friends. My Chinese is not very good and they often 7 me with it after class. The teachers are nice to me 8 . 

I like Beijing. Beijing is very 9 and there are many good places to go. But I don't like the 10 here. It's too hot in summer.