From red apples and yellow lemons to blueberr...

From red apples and yellow lemons to blueberries and green melons, fruit comes in many different colors. 1..

According to Lu Wei from the Chinese Academy of Sciences, fruit colors actually come from their different pigments（色素）.These pigments appear differently, depending on the fruit's environment. 2..

To find out how environment influences fruit colors, Chinese scientists studied more than 280 different fruit colors. They found that red fruit usually grow in cooler places. And instead of just growing in one place, you can find them growing in many places around the world. 3.. These fruits grow a lot in just one certain area. The scientists also found that the closer the fruit is to the equator（赤道）, the darker its color will be.

4.. Animals eat fruit and drop the seeds（种子）in other places later. This helps the fruit spread and grow in different places. Therefore, in order to attract animals, some fruit develop colors that are easy for animals to see.

However, animals see colors in a different way.5.. For example, birds can see red more easily than humans can. Therefore, there is more red fruit in areas where birds live. The lemurs（狐猴）of Madagascar are red-green color-blind. Many yellow fruit can be found there, as they can easily see this color.

阅读短文，把A~E五个句子填入文中空缺处，使短文内容完整。

A. Blue and purple fruit mostly grows in warm places.

B. Fruit needs to develop colors that are suited to animals' visual（视觉的）abilities.

C. Why do different kinds of fruit have so many colors?

D. Animals have also had an influence on fruit colors.

E. This causes the fruit to turn a certain color.

九年级英语补全短文5选5中等难度题查看答案及解析

Traffic lights are red, yellow and green. They are very important signals (信号). Traffic lights are usually placed at busy street corners to help control traffic. Sometimes, they are on streets near schools and shops, too. Most young children are taught what each of the colored lights means, so everybody can stay safe.

The first traffic signals were used for trains. The signals were put alongside railway tracks　 (轨道). The color red was used to mean “stop” because it warned people of danger. A red light was also the easiest color to see from a distance. Train drivers could see the red “stop” light ahead and had enough time to slow down and stop their trains. A green light was used to mean “take care” and a white light meant “go”.

However, there were many dangerous accidents on the train tracks. Some train drivers thought a star shining in the night sky was a white light that meant “go”. So the signals were swapped. The “go” light was changed to green and the “take care” light was changed to white.

During these times, people travelled by train or in carts pulled by horses. Years later, when cars were built, people began to drive them because they could travel much faster than horses. However, the road rules for drivers were not very clear and many people were hurt crossing the roads. Yellow warning signs had to be placed beside the roads to remind drivers to take care and allow people to cross safely.

Today, towns and cities all over the world have traffic lights. Red and green lights match the signals used on the railways. Yellow lights are easy to see, so they are used to warn drivers that they should slow down and prepare to stop.

1.Why was the color red used to mean “stop”?

A.It reminded people of traffic rules.

B.It helped trains run smoothly.

C.It gave people a warning of danger.

D.It was the first color people thought of.

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

A.Designed. B.Exchanged. C.Suggested. D.Compared.

3.In which order did the “take care” light develop?

a. A white light　　　　　　 b. A green light.　　　　　　　　 c. A yellow light.

A.a一c一b B.b一c一a C.a一b一c D.b一a一c

4.What is the passage mainly about?

A.The advantages of traffic lights. B.The history of traffic lights.

C.The importance of traffic lights. D.The meanings of traffic lights.

九年级英语阅读单选中等难度题查看答案及解析

The child has many colourful kites：red, yellow, blue, green 　　　　　　 .

A.and on B.and so on C.so on D.and so

九年级英语单选题简单题查看答案及解析

In autumn, many green ________ change to yellow, orange or red.

九年级英语单项填空困难题查看答案及解析

It’s cloudy and _____. I think it’s going to rain soon.

A. blue　　 B. yellow　　 C. red　　 D. grey

九年级英语单选题中等难度题查看答案及解析

—Look! The traffic lights turn _______.

—We should stop.

A. blue　　 B. yellow　　 C. red　　 D. green

九年级英语单选题中等难度题查看答案及解析

—Which colour do you like better, yellow or green?

—I'm afraid _______. I think red is the best!

A.both B.either C.neither D.none

九年级英语单选题简单题查看答案及解析

— Will you please write your note on “Red Apple” and _____ it to me tomorrow morning?

— What about the day after tomorrow? My computer doesn’t work well now.

九年级英语单项填空简单题查看答案及解析

Do you love to eat blueberries(蓝毒)? They grow on bushes(灌木丛). Each blueberry is small and round. Many blueberries can grow on one bush. At first, the blueberries aren't blue. They are green. You can't eat the green berries. They need a lot of sun and rain to help them become fat and sweet. When the berries turn blue, they are ripe(成熟的)and sweet.

Some farmers grow blueberries in big fields. After the blueberries are ripe, people put them into boxes and bring them to stores and supermarkets. People buy the blueberries and take them home to eat. After they wash the blueberries, they eat them one by one. Many people like to cook with blueberries. Some like to make blueberry muffins(松饼). Some like to make blueberry juice. Others like to make blueberry ice cream. It is very cool!

1.What does a blueberry look like?

A. It is like a bush.　　 B. It is big and long.

C. It is small and round.　　 D. It is like a red strawberry.

2.According to the passage, people don't make 　　　　 with blueberries.

A. ice cream　　 B. muffins　　 C. juice　　 D. noodles

3.What's the right order(顺序)according to the passage?

a. Farmers grow blueberries.

b. People buy blueberries.

c. People wash blueberries.

d. Blueberries become blue.

e. People eat blueberries one by one.

A. a-b-c-d-a　　 B. c-d-a-e-b　　 C. a-d-b-c-e　　 D. e-b-c-d-a

九年级英语阅读单选中等难度题查看答案及解析

A boy was walking home from school when he saw a large, red apple on the tree near a house. The boy didn’t like eating __35__ very much. He preferred a piece of chocolate if he was given the choice, but this time, seeing the nice apple, the boy wanted it very much. The more he looked at the apple, the __36__ he felt and the more he wanted it.

He stood on tiptoe (脚尖), stretching (伸展) as high as he could, but he was still unable to touch it. He began to __37__ up and down, as high as he could, at the top of each jump stretching his arms to get the apple. Still it remained out of __38__.

Not giving up, he thought, if he had something to __39__ on, he could reach it. His school bag wouldn’t give enough height and he didn’t want to __40__ the things inside, like his lunch box, pencil case, and Gameboy. Looking __41__, he hoped he might find an old box, a rock, or, with luck, even a ladder, but he found nothing that he could __42__.

He had tried everything he could think to do. Without seeing any other choices, he gave up and started to walk away. At first he felt angry and disappointed (失望的) thinking about how hungry he had become from his __43__, and how he really wanted that apple. The more he thought like this, the more unhappy he became.

However, the boy of our story was a __44__ one, even if he couldn’t always get what he wanted. He started to say to himself, “This isn’t helpful. I don’t have the apple and I’m feeling unhappy as well. There’s __45__ more I can do to get the apple. That is unchangeable. But we should try to __46__ our feelings. If that’s the case (情况), what can I do to feel better?”

1.A. fruits         B. meat             C. vegetables       D. rice

2.A. sadder         B. angrier          C. hungrier         D. happier

3.A. jump           B. look             C. walk             D. climb

4.A. hope           B. hand             C. sight            D. reach

5.A. put                B. stand            C. work             D. hold

6.A. break          B. shake            C. use              D. change

7.A. down           B. up               C. around           D. out

8.A. move           B. take             C. hold             D. use

9.A. wishes         B. ideas            C. efforts          D. troubles

10.A. smart         B. kind             C. brave            D. careful

11.A. something     B. anything         C. everything       D. nothing

12.A. change            B. express          C. forget           D. describe

九年级英语完型填空困难题查看答案及解析