Starting high school is a great experience for any teenager. Whether you are coming from a middle school(grades six through eight) or a junior high school(grades seven through nine), there are many things about high school that are different from your old school environment.{#blank#}1{#/blank#}   

    You will face being in a new school, making new friends in an unfamiliar class and getting to know new teachers. These new teachers will usually have higher academic(学术的) level than your middle and junior-high schoolteachers.{#blank#}2{#/blank#} In return, they expect you to work hard and develop your skills.

     On top of all this, peer pressure(同伴压力) to drink and smoke often increases in high school. {#blank#}3{#/blank#}

    Although there is a lot of pressure, it is nothing you cannot deal with. If you are feeling pressure to do something that you feel is wrong, talk to a friend, parent or counselor to find a solution(解决) .{#blank#}4{#/blank#} If you are not succeeding academically, find someone to help you. If you feel lonely, try to join a school club or group to make new friends.

    {#blank#}5{#/blank#}With time, you will come to be thankful for everything about your experience. On the point of starting you high school, are you ready?

根据材料内容，从下面五个选项中选出能填入文中空缺处的最佳选项，使短文意思通顺、内容完整。

    This is Jill. She is twelve years old. She has two new friends. They are Sami and Pat. Sami is a girl. She's twelve. She is short and slim. She's from England. She's English. Pat is a boy. He is twelve too. He's tall and strong. He's from America. He's American.

    Today, I'd like to tell you something about the history of the United States. The United States covers a large part of North America. After winning freedom from England, it had only 13 states. Each of the states had a star on the national flag. As the nation grew, new states were formed and there were new stars on the flag. For a long time, there were 48 states. In 1959 and 1960, two more stars, standing for the new states of Alaska and Hawaii（阿拉斯加州和夏威夷州）,were added to the flag. Indians were the first people of the land. Many people came from England. It is for that reason that the language of the US is English.

    Many people seem to know well about the rain forests. Some people even go to the rain forests to spend some of their time trying to make friends with the plants and animals there. The scientists are actually hard at work studying the plants that grow in the very top level of a rain forest. Rain forests are one of the richest environments on Earth. They are home to millions of species of plants and animals. The red research raft provides scientists with a platform from which to study life in the treetops. Scientists can even sleep on the raft, so they can stay up in the treetops for days at a time.

    Rain forests cover only about 6 percent of Earth's land surface. However, they contain more than half of the plant species on Earth. Many of these plants provide useful medicines to use against human diseases. In fact, about 25 percent of prescription medicines in the United States are based on chemicals from rain forest plants. Scientists think that many new medicines might be developed from plants that are yet to be discovered.

    Unluckily, rain forests are disappearing. Rain forest trees are being cut down for wood. Huge chunks of the forests are cleared to provide land for farm animals and crops. Scientists haven't identified all the plants in these forests yet. Some scientists think thousands of kinds of plants that we'll never even know about are being destroyed each year.

    We live on the earth. We use the sea around us. What do we take from the ocean? And what do we give to it?

    We take fishes from the ocean—millions of kilograms of fish, every year, to feed millions of people. {#blank#}1{#/blank#}We take minerals (矿物) from the ocean. We can get salt by evaporating (蒸发) seawater. {#blank#}2{#/blank#}such as gold. {#blank#}3{#/blank#}Seaweed (海草) becomes food of many kinds—even candy and ice cream—as well as medicine. Believe it or not, fresh water is another gift from the sea. We can't drink ocean water. {#blank#}4{#/blank#}But ocean water becomes fresh water when the salts are removed. In the future, we will find ourselves depending more and more on fresh water from the sea.

    The sea gives us food, fertilizer, minerals, water and other gifts. What do we give the sea? We pollute the ocean all the time. {#blank#}5{#/blank#}Throwing waste into the ocean is killing off sea life. Yet as the world population grows, we may need the sea and its gifts more than ever.

    We are finally learning that if we destroy our sea, we might also destroy ourselves. Hopefully, it is not too late.