How airplanes fly?

People {#blank#}1{#/blank#} (try) for a long time before they invented a {#blank#}2{#/blank#} (success) "flying machine". Now there {#blank#}3{#/blank#} (be) so many {#blank#}4{#/blank#} (plane) in the sky.

    An airplane {#blank#}5{#/blank#} (fly) because of the upward force(力量) of {#blank#}6{#/blank#} (move) air against its wings(翼). To get that moving air, it needs something {#blank#}7{#/blank#} (push) it forward—like a motor-driven propeller(螺旋桨) or a jet engine(喷气发动机). You can fly a kite if there  {#blank#}8{#/blank#} (be) enough wind to hold it up. An airplane is like a kite with such force!

    More and {#blank#}9{#/blank#} (many) young people are getting to like making model planes now. How about you? Are you interested in it after {#blank#}10{#/blank#} (read) this article?

    When you sleep somewhere else, like at a summer camp or a friend's house, you know you're there for a fun time. But for some kids, when they are away from home they feel sad. They start to miss- their own beds, their own parents, and all the things at home. It's called being homesick (想家的). Do you want to feel less homesick? Here's how.

    Spend more time doing fun things. The more fun things you do, the less time you'll have to feel homesick. So try to take part in activities and soon you might start to have a good time.

    You can make a plan to call your mum or dad. For a one-night visit, maybe you can call once that night, and again in the morning. In the camp, you might set a regular day and time for a phone call home.  You can also send emails or short messages to keep in touch with family members and friends. If you're going to be away for a while, you might even write a letter! When you get in touch with someone, make sure to tell them about the fun things you're doing!

    Sometimes, just tell someone that you're feeling homesick. This will help you feel better. Maybe you can tell a friend that you feel homesick. And both of you can do something fun, such as telling jokes. If you're at a camp, a camp counselor (顾问) would be a good person to talk to. He or she might have some ideas to help you feel better.

    Rich or poor， young or old， we all have problems. We should learn how to deal with our problems. Here are some ways.

    Firstly， we should learn to forget.有时我们会生朋友的气。Good friendships may be lost. Sometimes children have disagreements and decide not to talk to each other. However， this usually does not last for long. This is an important lesson for us: we can solve a problem by learning to forget.

    Secondly， we should regard problems as challenges(挑战). Many students often complain about school.他们有太多的作业要做。They think the rules are too strict. Education is an important part of our development. As young people， it is our duty to try our best to deal with each challenge with the help of our teachers. Don't worry about our problems. Let's face the challenges.

①Jack let me play with his favorite toy car. I made it go too fast and it crashed(摔坏).  {#blank#}1{#/blank#}

②All my friends have many new clothes. But my parents can't afford them. I think it is a shame(遗憾的事).  {#blank#}2{#/blank#}

③My close friend always wants me to give him the answers in exams. But I really don't want to do that.  {#blank#}3{#/blank#}

④My friend Jenny always takes a walkman with her and listens to loud music. I think it may hurt her ears. But she doesn't seem to care.  {#blank#}4{#/blank#}

⑤Sam saw some bird eggs under a tree when we had a trip in the forest. He wanted to take them home. I stopped him. He was angry with me.  {#blank#}5{#/blank#}

A. Try to tell him it is wrong of you two to do that. Then try to help them with his lessons in your spare time.

B. Tell him that he is doing something bad to animals. If he takes the eggs home, how will their mother feel when she can't find them?

C. You can get some examples from papers, magazines or TV shows, and let her know it's really bad.

D. Say sorry to him first. And try to repair it. Or you may give him your favorite toy car instead. Or to buy a new one for him.

E. A person's look or appearance(外表)doesn't mean everything. The most important thing is to study hard and have a good future.

    The Maldives is a country in danger. This small country — made up of over 1,000 islands (岛) in the Indian Ocean—is under threat from rising sea levels ( 面临海平面上升的威胁).

    {#blank#}1{#/blank#}As the water in the sea gets warmer, it expands (膨胀). Very slowly, sea levels are rising. Over the next 100 years they may rise by 50cm or more.

    {#blank#}2{#/blank#}That's because its islands are very low (低的)! The highest place in the country is only about 2m above sea level. Many of its islands are less than lm above sea level. Every year, a lot of people come to the Maldives to enjoy its beautiful islands and beaches. {#blank#}3{#/blank#}

    People have already had to move away from some islands. Many have moved to the capital city, Maid.{#blank#}4{#/blank#}A high wall (墙) around the island keeps the city from the sea.

    For the people of the Maldives, it's hard to know what will happen in the future.{#blank#}5{#/blank#}And that's a future no one wants.

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    With their long tusks (象牙), elephants look strong. However, it is this feature that makes the animal endangered. Many of them are killed for their tusks. People make elephant tusks into crafts (工艺品) and jewelry and sell them to rich people.
    But can these priceless body parts grow back? The answer is no, Live Science said. The elephants' tusks are actually part of their teeth. Nearly all African elephants and most male Asian elephants have these long teeth. About one-third of the tusk is in the animal's skull (头骨). The tusk has a nerve (神经) running down its center. This makes it similar to your teeth. Once you lose a tooth, you will never grow a new one.
    Elephants use their tusks to protect themselves, lift things, dig water and gather food. But losing the tusk will not kill them. The way in which they lose the tusk is what matters. Usually, people get tusks by culling (限量捕杀), which means killing old and weak elephants. They also take tusks from the elephants that have died naturally.

    However, these sources aren't enough to keep up with the demand for ivory. Therefore, some poachers (偷猎者) kill healthy elephants and cut their faces open to remove the tusks. About 27,000 elephants are killed by poachers each year, according to National Geographic.
    As a result of poaching, some African elephants gradually evolved (进化) without tusks, which has allowed them to survive. In Mozambique, about 90 percent of African elephants were killed for their tusks and meat from 1975 to 1992, National Geographic reported.
    Scientists found that about a third of younger females—the generation born after 1992—never developed tusks.