You can certainly see sunrise and sunset from the moon surface,  1  you can't see them as  2  as you do from the earth.

Here on  3  earth, our planet's rotation(自转) carries us  4 daylight to darkness. That's true on the moon as well. But the moon's spin(旋转) is  5  slower than the earth's. An earth day lasts twenty-four  6  . A lunar day lasts about one earth month. That means  7 about two weeks between each sunrise and sunset on the moon.

    On the earth, when you watch sunset, you can see colored light for a while after the sun disappears. But if you watch sunset on the moon, you'll find it's  8  as midnight as soon as the sun  9 , because the moon doesn't have an atmosphere(大气层). And  10  , sunrise on the moon will come just as suddenly.

Some people think that they have an answer to the problems of automobile crowding and pollution in large cities. Their answer is the bicycle, or bike.

In a great many cities, hundreds of people ride bicycles to work every day. In New York City, some bike riders have even formed a group called “Bike for a Better City”. They claim that if more people rode bicycles to work there would be fewer automobiles in the downtown section of the city and therefore less dirty air from car engines.

For several years this group has been trying to get city government to help bicycle riders. For example, they want the city to paint special lanes—for bicycles only—on some of the main streets, because when bicycle riders must use the same lanes as cars, there may be accidents. “Bike for a Better City” feels that if there were special lanes, more people would use bikes.

    But no bicycle lanes have been painted yet. Not everyone thinks it is a good idea. Taxi drivers don't like the idea—they say it will slow traffic. Some store owners on the main streets don't like the idea—they say that if there is less traffic, they will have less business. And most people live too far from downtown to travel by bike.

The city government has not yet decided what to do. It wants to keep everyone happy. On weekends, Central Park—the largest open place in New York—is closed to cars, and the roads may be used by bicycles only. But “Bike for a Better City” says that this is not enough and keeps fighting to get bicycle lanes downtown. Until that happens, the safest place to bicycle may be in the park.

    Light travels at a very fast speed. It is about a million times 1 than the speed of sound. You can get some idea of this 2 by watching the start of a race (赛跑). If you stand some distance away from the starter, you can see smoke from his gun before the sound gets to your 3

    This great speed of light4some strange facts. Sunlight 5about 8 minutes to get to us. If you look at the light of the moon tonight, 6 that the light rays (光线) left the moon 1.3 seconds before they got to you. The nearest star is so 7 away that the light which you can see from it tonight started to 8 towards you several years ago. In some cases, the light from one of tonight's stars had started on its journey to you before you were born.

    So, to be exact, we can't say, "The stars are shinning 9." We have to say instead, "The stars 10 pretty. They were shining several years ago, but their light has only just got to the Earth."

    We see many animals, like rabbits, bees, dogs, birds, sheep…，but do you know 1these animals say things? First，let's see a rabbit. When a rabbit sees 2dangerous(危险的)，it runs away at once. When it runs, its tail moves up and 3.When others see this, they run away,4.

    Many other animals use this kind of language(语言). When a bee has found some food, it goes back to 5home. It cannot tell6bees where the food is by speaking to them，but it does a little dance in the air. This may tell other bees 7the food is.

    Some animals say things by8sounds like a man does. For example，a dog barks when a stranger(陌生人)comes near. Some birds can make several 9sounds, each with its own meaning. In a word, every animal10its own language.

    Nowadays, WeChat is becoming more and more popular in China. No matter where we are, we can sign up and send text or voice messages to our friends. We can also find a stranger to talk to by shaking the 1^. Another funny function is that WeChat can help to search for people  2 live nearby with the programme on. Many people like this function, 3 it can help them to find more people who they may know.

    In my opinion, WeChat is really4 useful chatting tool. It can help people 5 with their friends more easily.6 , it is also bad for people, especially for students .As you see, some people use WeChat 7 too long. It is not healthy to them .So I have some 8 on how to use it in a correct way. First, we should not use it when we are studying. We can't focus on our study if we use it. Second, we must be careful. We should neither show too much personal information9 trust strangers so much.

    We should learn how to use it properly. Remember, WeChat is not everything in your life.10depend too much on it.

    When you hear the word "scientist", what do you think of it? Many people think scientists are people in clean white coats, working in labs( 实验室). Some scientists do work in labs. But there are 1 scientists working in woods and jungles(丛林).  These scientists are called " animal behaviour (行为) scientists", and they study animals as they live in nature. Why don't these scientists catch animals and study them in zoos? The 2 is in the word "behaviour". Animal behaviour scientists want to learn 3 animals behave in their wild homes. When animals live in cages or in zoos, they do not act 4 as they do in the wild. They may fight (打架) 5each other, or they may not eat, or they may not raise (抚养) their babies as they usually do. To see real animal behaviour, scientists must go to the places 6the animals live. So animal behavior scientists go into the jungles, the woods or the deserts. There, 7most important tools are their eyes and ears. They watch and listen to the animals very 8. They write down everything that happened in notebooks. Though they live near the animals, the scientists are careful not to frighten them. If the scientists are 9, the animals will pay no attention to them. Then the scientists can see how the animals really live.

    The animal behaviour scientists hope what they've learned about animal behaviour can provide clues(提供线索) 10people learn to live with animals together more happily.