阅读理解 Have you ever heard someone use the phrase&quot;once in a blue moon&quot;？People use this expression to describe...

题型：阅读选择题类：常考题难易度：普通

广东省广州市荔湾区2018届九年级上学期英语期末质量检测试卷

阅读理解

Have you ever heard someone use the phrase"once in a blue moon"？People use this expression to describe something that they do not do very often．For example，someone might say that he tries to avoid eating sweets because they are unhealthy，but will eat chocolate"once in a blue moon"．Or someone who does not usually like to go to the beach might say"I visit the shore once in a blue moon．"While many people use this phrase，not everyone knows the meaning behind it．

The first thing to know is that the moon itself is never really blue．This is just an expression．In fact，the phrase"blue moon"has to do with the shape of the moon，not the color．

As the moon travels around the earth，it appears to change shape．We connect names with certain shapes of the moon．For example，when we can see a small part of the moon，it is called a crescent moon．A crescent is a shape that looks like the tip of a fingernail（指甲尖）．When we cannot see the moon at all，it is called a new moon．When we can see the whole moon，it is called a full moon．Usually，there is only one full moon every month．Sometimes，however，there are two full moons in one month．When this happens，the second full moon is called"a blue moon"．

Over the next 20years，there will only be 15blue moons．So you can seldom see a blue moon． This fact has led people to use the expression"once in a blue moon"to describe things they don't often do in their lives．

（1）、Which of the following would be a good example of using the phrase"once in a blue moon"？

A、Simon often tells jokes．Simon tells jokes once in a blue moon． B、Tom seldom remembers to do exercise．Tom does exercise once in a blue moon． C、Mary likes to go shopping every weekend．Mary goes shopping once in a blue moon． D、Cindy hates to stay up，but she stays up every day．Cindy stays up once in a blue moon．

（2）、When does a blue moon happen in nature？

A、When the moon has a blue color． B、When we cannot see the moon at all． C、When there are two full moons in one month． D、When we can only see a small part of the moon．

（3）、Which of the following is another example of something that has a crescent？

A、The letter"O"． B、The letter"M"． C、The letter"H"． D、The letter"C"

（4）、How often will a blue moon happen over the next twenty years？

A、Once a year． B、Less than once a year． C、More than once a year． D、At least twice a year．

（5）、What does the underlined part"This fact"in the last paragraph refer to？

A、A blue moon is not often seen during the years． B、The moon appears to change its shape． C、The moon itself is never really blue． D、A blue moon has to do with the shape of the moon．

举一反三

根据短文内容，选择最佳答案。
First, open the lid (-盖子) and put water, salt, and rice in the pot. Then put the cover on the pot and close the lid. Next, press (按) the button (钮) for "white" or "brown", and then press the "start" button. Let the rice cook for about 30 minutes. You'll hear a beeping sound when it's finished, but you should wait about five minutes before eating. Finally, take out the pot. Bring it to the table and enjoy your meal.

    In some science fiction movies, evil robots refuse to die, no matter how hard people fight back.
    Now science fiction has become science fact. For the first time, scientists have made a robot that can take a beating and keep on going. Scientists from Cornell University made the robot, which looks like a spider with four legs.
    Until now, even the most advanced (先进的) robot was almost certain to break down when it was damaged (毁坏). That is because its computer inside simply doesn't know how to make the machine work after its shape has changed.
    To deal with this problem, the scientists put eight motors (发动机) and two sensors (传感器) that read how the machine is working. They all give signals to the machine's software. Using this information, the computer can then figure out the machine's shape at any moment.
    The new technology is a big advance in robot-making, scientists say, and it's far from scary. It may someday help scientists create better artificial (假的) arms and legs and give new freedom to people who lose them. It might also help scientists understand how people and animals figure out their own sense of place in space.
    “It has been difficult to design robots that can work well when the environment changes or when it's damaged,” says Olaf Sporns of Indiana University in US. “With this work, we are nearer to solving this problem.”

配对阅读：左栏是人们在日常生活中浪费能源的五种现象，右栏是与其相对应的解决建议，请为每种现象选择相应的解决建议。

{#blank#}1{#/blank#} Every day in homes all over the world, people leave the lights on when no one is in the room.

{#blank#}2{#/blank#} Air conditioners（空调） are usually set at too low temperatures in summer.

{#blank#}3{#/blank#} A lot of water is wasted by using too much.

{#blank#}4{#/blank#} We'll have less and less gas（汽油）to use. Because more and more people buy cars.

{#blank#}5{#/blank#} People, especially children watch TV for too many hours.

A. Take a shower instead of a bath, for a bath uses twice as much as water. Don't wash hands with water running from the tap.

B. Plant more trees and grass around our houses.

C. Encourage people to do more outdoor activities. Get children to read more books instead of watching TV.

D. Always keep the saying in mind “Turn off the lights before leaving.”

E. We should walk to work, ride a bike to school, take a bus instead of driving a car.

F. We must often clean the air conditioners in order to save electricity. Also, set the temperature at 26℃.

G. Try our best to make friends with the countries in the Middle East and ask them to give us more gas in the future.

阅读理解

Building an app is a big project. If you want to build the next great smartphone app, you need a plan. First, think about the kind of app that you want to build. Will your app be a game? Will it be for business? Then make a schedule(日程安排)for building the app. You need plenty of time for research before you are ready to build.

Now you're ready to make the app. Building an app is like a puzzle(拼图)with many different parts. You can build it yourself or find a company to help you. There are many videos and websites that can teach you to build one. Some websites provide "building blocks" for app developers. As you build, you pick blocks from the website and put them in your app.

After you build your app, you need to check it carefully. Look for bugs. Most apps have several problems to fix. Show your app to people. Ask their opinions. Mike sure everything works before letting people download it. There are so many tools that can help you build apps. Having the right tools will make the work easier. Now almost anyone can make a new app.

阅读理解

There is a lot of salt on the Earth, and it mixes very well with water.

There is some salt in all water. Water on the land runs into lakes and rivers. These rivers run into the seas and oceans. They carry a little salt with them. Some of the ocean water moves into the air and clouds. It evaporates. Salt cannot evaporate. It stays in the oceans.

The water in the oceans has more salt than river water. There is about 3. 5% salt in the ocean water. Some seas have more salt than others.

Some of the water leaves the lakes. It evaporates, but the salt cannot. These lakes are very salty. There are two famous lakes like this. They are the Dead Sea in the Middle East and the Great Salt Lake in Utah(犹他州）in the United States. They are much saltier than the Atlantic Ocean（大西洋）and the Pacific Ocean(太平洋）.

阅读下面短文，从每题所给的A、B、C、D四个选项中选出能正确回答所提问题或完成所给句子的最佳答案。

The movie The Martian (《火星救援》) is very popular among space lovers. It shows an astronaut trying to live on Mars.

Although the idea of living on Mars is great, the reality does not look so good. Mars does not have a friendly atmosphere (大气层) for humans. There is very little oxygen there. And because it is too far away from the sun, it is also very cold there. Sometimes the temperature on Mars can be -133℃. This is much too cold for humans.

However, scientists say it might be possible to live there even without a good atmosphere. Daytime on Mars is almost the same as Earth's. It means there's enough sunlight to grow plants inside safe buildings. However, they would have to grow in soil from Earth. Mars does not have a strong enough atmosphere to stop the radiation (福射) coming from space, which makes it dangerous to grow things in the soil.

The radiation also causes problems for our health. One way to live there is to build homes underground or in the rocks on the planet. This can help humans keep away from the radiation and keep warm.

When could we live on Mars? Scientists are hoping to make it possible to live on Mars. Let's wait and see.

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