Have you ever wondered how a kite stays in th...

Have you ever wondered how a kite stays in the air? Wind is very important but so are two scientific words: gravity(重力) and lift(举力).

When something is in the air, gravity is what pulls something back to the ground. _______ you throw a ball in the air, it comes back down because of gravity. When leaves ____ trees onto the ground, that’s gravity. When you put a kite in the air, gravity wants to bring it ____ . Then what keeps it up? Wind! Wind creates lift.

Lift is what happens when wind pushes against something and carries it up. When a plastic bag gets caught in the wind, lift is what causes it to rise into the air. When you put a silk scarf ____ a fan, lift causes ____ to wave(摆动). An object’s lift depends on the size of its surface or its area. A piece of _____will float（漂浮）in the wind, but it won’t float if you make that paper into a ball. That’s because you’ve made the surface smaller.

To find out if there is enough wind to fly a kite, go outside and look up. If you ______leaves dancing on trees or flags waving sideways, it’s ____ good kite-flying weather. When the wind is strong enough to move a flag, it’s moving ____ 7 to 18 miles an hour. That’s just ____ to lift a common kite.

1.A. Which B. What C. When D. Where

2.A. take off B. get off C. keep off D. fall off

3.A. up B. down C. off D. out

4.A. in the middle of B. n the front of C. at the back of D. in front of

5.A. t B. them C. this D. that

6.A. bread B. cake C. card D. paper

7.A. hear B. see C. smell D. feel

8.A. probably B. finally C. quickly D. hardly

9.A. on B. at C. in D. by

10.A. wrong B. favourite C. right D. strange

九年级英语完型填空简单题查看答案及解析

Mechanical Engineering

Do you like to build with blocks? Have you ever wondered how planes stay in the air? Do you like to design and create new things? If you do，a career(职业）in mechanical engineering might be right for you！

A mechanical engineer is responsible for coming up with and designing mechanical systems. Mechanical systems can include machine design，heating and cooling equipment，and product design.

Mechanical engineers are in high need right now. There are a lot of job openings for mechanical engineers，but there aren't enough people to fill those jobs. Because there is a high need for engineers and the work requires specialized knowledge，engineers get paid more than some other careers.

To be a mechanical engineer，you need to graduate from college with a bachelor's(学士）degree. In college，you will learn problem solving and critical thinking skills.

Problem solving is very important in the field of mechanical engineering.To come up with the best solution to a problem，mechanical engineers need to think in different ways. They also need to be creative，because they may need to make something that's never been made before. Paying attention to details(细节）is important as well. Many designs depend on a lot of little details.

Mechanical engineers also need to be able to use different tools，such as calculators，high-speed cameras，and computers. There are many computer programs mechanical engineers use to create designs，run scenarios（方案），and do research.

As with many other jobs，mechanical engineers should be able to meet deadlines(期限）and work well with other people. Some jobs can be done with just one person， but more often mechanical engineers work on a team to complete a project. If an engineer cannot manage his or her time well and misses a deadline，the whole team gets delayed(拖延）．

Some engineers work in an office，and some travel to different worksites while a machine or product is being built，so they can help solve any problems.

Mechanical engineering takes a lot of thought. It is a great career for people who like to make objects and machines work，solve problems，and be creative！

1.What is a mechanical engineer responsible for?

2.To be a mechanical engineer，what will a student learn in college?

3.How can mechanical engineers come up with the best solution to a problem?

4.Why should a mechanical engineer be able to meet deadlines?

5.Where do mechanical engineers work?

九年级英语回答问题中等难度题查看答案及解析

Have you ever wondered who is killing time in the cafes at three in the afternoon while you are busy at school? Linda and I found the answer when we got part-time jobs at Starbucks and KFC during the summer vacation?

九年级英语阅读理解困难题查看答案及解析

Have you ever stayed deep underground in a cave? You have no food and the oxygen(氧气) is running out. You're not even sure if anyone knows you're down there.

A soccer team of 12 young Thai boys, as well as their coach, had to go through this experience this summer. They became trapped in a cave in Thailand on June 23, spending 18 days inside until they were saved by an international team of divers(潜水员）. After hearing the news that a former Thai Navy SEAL(海 军海豹突击队员）died while trying to save these kids, my friends and I talked about the situation and felt as if there might be no way to get the children out.

But we held out hope anyway. We refused to give up hope for these kids, even when the situation seemed quite dark. We were rewarded(奖励)for our hope when they were finally saved.

It can be hard to hold out hope in dark times. Every day, we read or hear about the terrible things that happen in the world. This makes it hard for us to stay positive. Some people go through their lives thinking that the worst is always just around the corner.

However, I believe that it's especially important to stay positive during difficult times. This is the best way to deal with the challenges that we face in life. As people often say: there is always a light at the end of the tunnel(隧道).

1.How many people were trapped in a cave in Thailand on June 23?

A.12. B.13. C.18. D.23.

2.What does the underlined word “trapped” in Paragraph 3 mean?

A.捕获的 B.收集的 C.受困的 D.失望的

3.From the story, we know that _______.

A.not all of the kids were saved

B.a man died when he tried to save the kids

C.the writer and his friends also joined in the rescue efforts

D.the Thai Navy SEAL were rewarded by the government

4.According to the passage, when we face challenges, we should _______.

a. hold out hope　　 b. stay positive　 c. give up　　 d. wait for help

A.a b B.b c C.a c D.c d

九年级英语阅读单选中等难度题查看答案及解析

Have you ever stayed deep underground in a cave? You have no food and the oxygen(氧气)is running out. You're not even sure if anyone knows you're down there

A soccer team of 12 young Thai boys, as well as their coach, bad to go through this experience this summer. They became trapped ( 困 住 )in a cave in Thailand on June 23,spending 18 days inside until they were saved by an international team of divers(潜水员).

After hearing the news that a former Thai Navy SEAL（海军海豹突击队员）died while trying to save these kids, my friends and I talked about the situation and felt as if there might be no way to get the children out.

But we held out hope anyway. We refused to give up hope for these kids, even when the situation seemed quite dark. We were rewarded for our hope when they were finally saved.

It can be hard to hold out hope in dark times. Every day, we read or hear about the terrible things that happen in the world. This makes it hard for us to say positive. Some people go through their lives thinking that the worst is always just around the corner.

However, I believe that it's especially important to stay positive during difficult times. This is the best way to deal with the challenges that we face in life. As people often say: there is always a light at the end of the tunnel(隧道).

1.How many people were trapped in a cave in Thailand on June 23?

A.12 B.13 C.18 D.23

2.Paragraph 2-3 were written to________

A.describe how people felt after being trapped B.explain how the 12 soccer players were saved

C.give an example of a challenge D.describe how to escape from a cave

3.From the story we know that ________

A.Not all of the kids were saved

B.A man died when he tried to save the kids

C.The author and his friends also joined in the rescue efforts

D.The Thai Navy SEALS were rewarded by the govermnent

4.According to the passage, when we face challenges, we should________.

a. hold out hope　　 b. stay positive　　　 c. give up　　　 d. wait for help

A.ab B.bc C.ac D.cd

九年级英语阅读单选中等难度题查看答案及解析

Have you ever wondered about the secret life of the tasty lobster(龙虾)? In the sea, it is yellow, orange, grey, green, brown or even blue. Cooking turns it red. Lobsters are nocturnal creatures(夜行物), so it is best to hunt(捕捉) them at night when they are active. You can catch lobster by hand, but you should wear thick gloves because lobster’s claws are strong. A very large lobster could cut your finger. Interestingly, in the past, lobsters were only served to prisoners as they were considered as a poor man’s food. Nowadays, lobsters are an expensive and popular dish.

1.What color is the lobster when cooked?

A. Blue B. Red

C. Yellow D. Green

2.When is the best time to hunt the lobster?

A. In the morning B. In the afternoon

C. At noon D. At night

3.Can people catch the lobster by hand without thick gloves?

A. Yes, they can B. No, they can’t

C. Not mentioned D. No answer is right

九年级英语阅读单选简单题查看答案及解析

Have you ever wondered about the secret life of the tasty lobster(龙虾)？In the sea, it is yellow, orange,grey,green, brown or even blue. Cooking turns it red.

Lobsters are nocturnal creatures(夜行物)，so it is best to hunt(捕捉) them at night when they are active. You can catch lobster by hand, but you should wear thick gloves because lobster’s claws are strong. A very large lobster could break your finger.

Interestingly, in the past, lobsters were only served to prisoners as they were considered as a poor man’s food. Nowadays, lobsters are an expensive and popular dish.

1.What color is the lobster when cooked?

A. Blue　　 B. Red　　 C. Yellow

2.When is the best time to hunt the lobster?

A. In the morning　　 B. In the afternoon　　 C. At night

3.Can people catch the lobster by hand?

A. Yes, they can　　 B. No, they can’t　　 C. Not mentioned

4.What is interesting about the lobster?

A. The lobster is colorful in the sea.

B. The lobster is active during the night.

C. People seldom considered the lobster as good dish in the past.

九年级英语阅读单选中等难度题查看答案及解析

Kite flying is a sport of sending up into the air by means of the wind, a light frame covered with paper, plastic or cloth.

People have been making and flying kites for about 2,000 years. But no one knows exactly when or how the first kite was made. In 478B.C., a Chinese philosopher, Mo Zi, spent three years making a wooden bird. Later, his student Lu Ban began to use bamboo to make kites. Another record of kite flying was in about 200B.C. when the Chinese General Han Xin flew a kite with a flute tied to it. The flute made some sounds along with the Chu song as the kite rose into the air, which crashed the morale(士气) of the enemy quickly. The ancient Chinese also used bird-kites—usually made of the traditional silk—to carry ropes across rivers and valleys.

In the 13th century, Marco Polo wrote about how the shipping businessmen flew the huge kite in the wind before the ship set sail. They predicted the voyage in this way. If the kite went high and straight, it meant a quick and successful voyage, but if it did not fly well, it was a bad omen(预兆).

Kites have also been used for scientific purposes in the western world. In 1752, Benjamin Franklin tied a key to a kite and flew it in a storm to find out that lighting was a form of electricity. In the 1890s. Lawrence Hargrave invented the box kite to test ideas about flight. From 1898 to 1933, the United States Weather Bureau used box kites to collect weather data. The Wright brothers also experimented with kites. What they learnt helped them make the first airplane in 1903.

Today, most people fly kites as a hobby. Kite festivals are organized in many cities in all parts of the world.

1.Which of the following was NOT be used to make kites in ancient times?

A.Wood B.Bamboo C.Plastic D.Silk

2.Prom Paragraph 2, we can know that ________.

A.the first kite was created by Mo Zi B.no one really knows who invented the kite

C.Han Xin was the first one to record kite flying D.the ancient Chinese once made kites out of birds

3.Why did the shipping businessmen fly a huge kite in the wind before the ship set sail?

A.To cut down wind resistance. B.To predict whether they would succeed in their trade.

C.To define wind speed during their voyage. D.To make sure whether their sailing would be smooth.

4.What can we learn from the passage?

A.The United States Weather Bureau used box kites to predict the weather.

B.Benjamin Franklin invented electricity with the aid of a kite.

C.The first airplane was inspired by box kites to some degree.

D.Kites have promoted the development of scientific research.

5.The passage is mainly about ________.

A.the invention of kites B.different forms of kites

C.the history of kites D.some latest records about kites

九年级英语阅读单选中等难度题查看答案及解析

You Can Make a Windsock(风筒)

Have you ever seen a windsock blowing in the wind? Well, you can make one of your own! This is a fun project that you can do with things you may have. You just need to follow a few easy steps.

You will need:

● one piece of heavy colored paper　　　　　　　　 ● five ribbons

● strong tape　　　　　　　　　　　　　　　　　　　　 ● a string

● a pencil

What to do:

Step 1: Draw pictures on the paper. You can write your name on it. Do anything that will make it special to you.

Step 2: Make the paper into the shape of a tube. Hold one of the shorter edges(边缘) over the other. Then make them together with the tape at each end and in the middle.

Step 3: Use a pencil to make a hole into both sides of the tube. The holes should be only on one end of the tube. Pull the string through both holes. Then tie the ends of the string together.

Step 4: Now make five holes around the top of the other end of the tube. Put a ribbon through each of the holes. Tie a knot in the ends. Make sure the knots are bigger than the holes.

Now your windsock is ready to use, but how does it work? The shape of the tube plays an important part. Wind blows through the tube and makes it fly and dance around. Hold the windsock up in the air by its string and run around. It will fly behind you. You can also hang it outside and watch it dance around on its own!

1.You draw pictures on the paper to make the windsock ________.

A. fun　　 B. heavy　　 C. strong　　 D. special

2.Which of these things do you need for Step 2?

A. Tape.　　 B. Ribbons.　　 C. A pencil.　　 D. A string.

3.What do you do after you put ribbons through the holes in the tube?

A. Make holes in the tube.　　 B. Tape the tube together.

C. Tie knots in the ribbons.　　 D. Put a string through the hole.

4.What is probably the most important to make a windsock work?

A. Its shape.　　 B. Its size.

C. The color of the paper.　　 D. The number of the holes.

5.What is the main purpose of this article?

A. To tell an interesting story.　　 B. To explain how to do something.

C. To teach an important lesson.　　 D. To show what a windsock is like.

九年级英语阅读单选困难题查看答案及解析

You Can Make a Windsock(风筒)

Have you ever seen a windsock blowing in the wind? Well, you can make one of your own! This is a fun project that you can do with things you may have. You just need to follow a few easy steps.

You will need: one piece of heavy colored paper, five ribbons, strong tape, a string and a pencil.

What to do:

Step 1:Draw pictures on the paper. You can write your name on it. Do anything that will make it special to you.

Step 2:Make the paper into the shape of a tube. Hold one of the shorter edges(边缘) over the other. Then make them together with the tape at each end and in the middle.

Step 3: Use a pencil to make a hole into both sides of the tube. The holes should be only on one end of the tube. Pull the string through both holes. Then tie the ends of the string together.

Step 4: Now make five holes around the top of the other end of the tube. Put a ribbon through each of the holes. Tie a knot in the ends. Make sure the knots are bigger than the holes.

Now your windsock is ready to use, but how does it work? The shape of the tube plays an important part. Wind blows through the tube and makes it fly and dance around. Hold the windsock up in the air by its string and run around. It will fly behind you. You can also hang it outside and watch it dance around on its own!

1.You draw pictures on the paper to make the windsock _____.

A. fun B. heavy C. strong D. special

2.What do you do after you put ribbons through the holes in the tube?

A. Make holes in the tube. B. Tape the tube together.

C. Tie knots in the ribbons. D. Put a string through the hole.

3.What is probably the most important to make a windsock work?

A. Its shape. B. Its size.

C. The color of the paper. D. The number of the holes.

4.What is the main purpose of this article?

A. To tell an interesting story. B. To explain how to do something.

C. To teach an important lesson. D. To show what a windsock is like.

九年级英语阅读单选简单题查看答案及解析