Have you ever heard an echo of your voice? An echo is a reflected(反射)sound. Stand in a very large, empty h...

题型：阅读选择题类：常考题难易度：困难

    Have you ever heard an echo of your voice?
    An echo is a reflected(反射)sound. Stand in a very large, empty hall with nothing on the walls. Then shout. The sounds you make will hit the walls and come back to you. The walls reflect the sounds. These reflected sounds are called “echoes”.
    We can use reflected sound to make sound travel farther. Hold a watch about fifty centimeters from your ear. You cannot hear it. The sound of the watch travels a short way in all directions. It does not travel as far as your ear. You can make it travel to your ear by using a roll of cardboard(纸板筒).
    Make the roll of cardboard about fifty centimeters long. Put one end over your ear and hold the watch at the other. Now you can hear the watch because the sound has not gone in all directions. It is reflected down the roll to your ear.
    A megaphone(喇叭筒)works in the same way. It makes sound travel farther. It reflects the sound into a beam which can travel a long way. In the ship, the sailor uses the megaphone to make his voice travel. Without the megaphone, his voice cannot travel far.
    We use reflected sound in many ways. We use it to measure the depth of the sea, for example. Among the animals, bats and whales use reflected sound to tell them where they are and what things are near them.

（1）、Which is the right order of hearing our echo in a very large, empty hall?
a. We hear the reflected sound b. The sound returns to us
c. The sound hits the walls d. We make a sound

A、c, b, a, d B、c, a, b, d C、d, c, b, a D、d, b, c, a

（2）、 From the text we learn that __________ .

A、reflected sound is useful only to blind people B、people haven't made use of reflected sound yet C、bats use reflected sound to fly and get food D、whales don't use reflected sound as they live in the sea

（3）、 If you haven't got a megaphone, ____ will help you to make your voice travel farther.

A、a long piece of wood B、a roll of cardboard C、a thin thread D、a long piece of silk

举一反三

    Many places in the world need more fresh water. Every country is trying to find ways to turn salt water into fresh. Why aren't there many factories like the Symi factory?
    In some places the sun is not hot enough. Or it does not shine every day.
    In such places other ways of heating sea water can be used. These ways cost more money, but they work faster than the sun. By boiling sea water with high heat a lot of fresh water can be made quickly.But heating is not the only way to get fresh water from salt water. Other ways are tried.
    One way is freezing. The fresh part of salt water freezes first. To get fresh water, the bits of ice are taken out.
    Which way is the best? The one that gives the most water for the least money. It may be a different way for each place.
Symi's way seems very good for small, hot places. It does not make much water at a time. But the factory is easy to build and costs little. That is why people in many dry places talk about Symi.

阅读理解

Hi, everyone. I'm Tina. I think our life in 2060 will be different from our life at the moment. There will be many robots in my house. Because robots will be cheap. And these robots will help my family do many kinds of work every day. Every morning the clock-robot will ask me to get up. Then the clothing-robot will dress me quickly. Next the kitchen-robot will make breakfast for me. When I get out of the house with my schoolbag, a car-robot will wait for me. After I show it my school ID card, the car will go. And then the car-robot will check my homework. When we get to school, the car-robot will say to me "See you tomorrow, Tina. Good luck."

In the morning, I will have three lessons with my classmates. We'll study on the Internet. We'll use the e-book. The teachers are all robots. They are in different sizes and they can answer any question about any subject. In the afternoon, we'll go to the science lab to have two classes in a new plane. After class, we'll play football with robots. My classmates and robots can all be my friends. Don't you think the life with robots in the future will be fantastic?

请先阅读下面短文，掌握其大意，然后根据短文内容从下面的七个选项中选择五个还原到文中，使短文意思通顺、结构完整，并在答题卡上将其序号涂黑。一空一句。

Feel down? Hug a tree! Recently, many Chinese young people have turned to trees to lower (减少) stress. It sounds strange. {#blank#}1{#/blank#}

US scientist Edward Wilson pointed out that humans were born to love being around other living things. Human's love for nature is "in our DNA". {#blank#}2{#/blank#} It's also one of the reasons why people love cute pets.

Some scientists have studied why tree-hugging can help with our health. A study in 2021 reported that the activity can create more oxytocin (催产素). {#blank#}3{#/blank#} The higher the level of oxytocin is, the happier we may be. Hugging trees for only 21 seconds can lead to an increase in oxytocin.

Hugging trees also helps cut cortisol (皮质醇) production, which makes us feel better. {#blank#}4{#/blank#} The brain produces more cortisol when the person is worried, angry, or very sad.

Although the activity is helpful to us, it's important to keep in mind that we shouldn't hurt nature while hugging trees. Trees play a valuable role in our environment. Many small living things live in the tree. {#blank#}5{#/blank#} You need to be gentle when hugging trees—just like how you hug a friend!

A. Cortisol is a sign of stress.

B. It's something connected with feelings.

C. It is normal for adults to be stressed out.

D. And they are too small to be seen.

E. Worries can be a heavy weight over our shoulders.

F. However, there's some science behind the act of tree-hugging.

G. His idea helps to explain why people prefer natural views (景色) to city views.

A) 阅读下列短文，根据短文内容从每小题所给的A、B、C、D四个选项中选出最佳答案。

Children's games in ancient China

Flying kites

Kites have quite a long history. The earliest kites were made of wood. Now in China, the three most famous kites are the Beijing kite, Tianjin kite and Weifang kite, each of which has its own characteristic (特征).

Playing diabolo

Diabolo is always made of wood or bamboo and is hollow (空心的) in the center. When juggled (抛接) on ropes, the high-speed rotating (旋转的) diabolo will make a sound. Playing diabolo is a very interesting game.

Watching shadow plays

The closest thing to watch a film or television during ancient times was watching a shadow play. People control puppets (木偶) behind the screen while singing with music to tell a story. Shadow play was listed as a national intangible cultural heritage (非物质文化遗产) in

2006.

Setting off firecracker

Firecrackers have a history of more than 2,000 years. It is said that people burnt bamboo joints (节) to make it blast (爆炸) to drive away the beast named Nian in ancient China. Firecrackers are still set off during Spring Festival to symbolize hope and luck.

阅读短文，回答问题

Friends are very important in everyone's life because friends are always there when we need them. It's great to have many friends and I can't think about my life without my friends.

My best friend is Lisa. When I first met her, I was five. She is one year older than me. Now she is in the same class with me. In the seventh grade, she is tall and quite thin. She has long curly blonde hair and blue eyes. I am not so beautiful. Sometimes I wish I could be as beautiful as she is.

My name is Molly. I am tall enough but little fat. Lisa and I like doing a lot of things together and talking about different things. She always helps me with my math and I sometimes help her with her English and history. I have to do a report(报告) on science, but I didn't understand what the teacher said. The next day I read it in front of the class, but the teacher told me that my report was wrong and all my classmates laughed at me. I felt very bad about myself. Lisa was the only one who didn't laugh at me. She tried to be nicer than anybody else and make me happy.

I am a shy person and sometimes I feel that people don't understand me. Lisa is friendly and everybody loves her. She is also smart and she can deal with (解决) everything. I am happy to have a friend like her.

短文填空

We have a lot of trouble in our life, but we have to face them. When you are feeling {#blank#}1{#/blank#}（happy）or forgetting how great you are, there are six ways to make you {#blank#}2{#/blank#} （feel）good about yourself.

Look in the mirror and say to {#blank#}3{#/blank#} （you）, "I'm a special person and there's no one {#blank#}4{#/blank#} the world like me. I can do anything!" It may not {#blank#}5{#/blank#}（sound）so good, but it really works!

Do something nice for someone. {#blank#}6{#/blank#}（help）others always makes you feel good.

Smile! Be {#blank#}7{#/blank#}（friend）to people you meet. Look for the good things in your friends and family.

Learn something new! Have you always wanted to decorate your own room or learn how to swim? Go for it! New challenges are fun and give you a sense of accomplishment when you have finished.

Read and start {#blank#}8{#/blank#} diary. Turn off the TV and let your imagination（想象）fly! If you have any thoughts, dreams or anything you want, write {#blank#}9{#/blank#}（they）down! Writing always helps to express your feelings.

Stay {#blank#}10{#/blank#} your family. We all have our family time. Talk with your mom and dad or maybe even your cousin.

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