In Beijing, flowers usually come out_________...

In Beijing, flowers usually come out_________ April every year.

A.in B.of C.on D.at

九年级英语单选题简单题查看答案及解析

Flowers usually come out ______ spring every year.

A．in               B．at                C．on               D．of

九年级英语单项填空中等难度题查看答案及解析

Cherry blossoms(樱花) usually come out between March and April, depending on the local weather. 　　　　　　 the time of this year, Beijing’s Yuyuantan Park becomes a sea of pink and white.

A.By B.At C.On

九年级英语单选题简单题查看答案及解析

— The rape flowers in Xinghua ______ beautiful in April.

— Yes, many tourists come to watch them every year.

A. sound                     B. listen           C. taste           D. look

九年级英语单项填空中等难度题查看答案及解析

It happens every spring. Flowers come out everywhere on the same day. But how do plants “know” when to flower?

For years, it has been a difficult question for scientists. But a US research group may have finally answered it—the secret lies in a protein(蛋白质)called FKF1. This helps plants to know when the days become long and when they get short. Then they can tell the seasons are changing.

Researchers found the FKF1 protein when they were studying a plant called Arabidopsis(拟南芥). It is sensitive(敏感的)to sunlight, and can be made active by sunlight.

Plants produce this protein every day in the late afternoon all year. If there is no light at this time, for example in winter when the sun goes down early, the protein won’t be active. But when spring comes and the days get longer, the FKF1 protein can be made active by day light and the plants “know” it is time to flower. “If there is light in the late afternoon, plants will know that the days are getting longer and that it is the best time for flowers to come out,” explained Takato Imaizumi, leader of study. But when conditions are poor for growing, such as during autumn or winter when the weather is cold and days are short, plants won’t flower.

Although researchers have only studied how the FKF1 protein works in the Arabidopsis, they believe that it is the same with many other plants, including crops such as rice and wheat. This could be useful to the agricultural industry.

“If we can control when flowers come out, we might be able to increase crop production,” Imaizumi said.

1. The passage is mainly about ____.

A. how plants “know” when to flower

B. what people can do with plants

C. how seasons are changing

D. what kind of plant Arabidopsis is

2.Scientists found the FKF1 protein when they were____.

A. answering a question

B. controlling the clours of flowers

C. planting flowers in the garden

D. studying a plant called Arabidopsis

3.The best time for flowers to come out is when____.

A. it rains in spring

B. there is light in the late afternoon

C. it is getting dark

D. the sun goes down early

4.Scientists believe that____.

A. other plants also know when to flowers

B. flowers are more valuable than fruits and vegetables

C. people have known how to control when flowers come out

D. if the weather is cold and days are short, plants will flower

九年级英语阅读理解中等难度题查看答案及解析

As the spring comes, the flowers began to _____.

九年级英语单项填空简单题查看答案及解析

Colorful flowers come out now. It’s wonderful for us to _________ nice flowers everywhere in spring.

A.smell B.taste C.sound D.feel

九年级英语单选题中等难度题查看答案及解析

Colorful flowers come out now. It’s wonderful for us to __________ nice flowers everywhere in spring.

A. smell　 　 B. taste 　　 C. sound 　 D. feel

九年级英语单项填空中等难度题查看答案及解析

阅读下面短文，并借助上下文内容，在空格里填上一个合适的单词，使短文合理通顺。

One cool April 22 morning, people started the day as usual. Yet it was not a normal day. What’s so special about April 22? The answer is simple. It is Earth Day. People all　 1.　 the world celebrate this important day. The idea of having a special day to celebrate Earth began　 2.　　 the 1960s. Life was very different then. Few people talked or even thought about the environment. Most people had no idea　 3.　　 dirty our air and water were.

On April 22, 1970, twenty million Americans　 4.　　 part in the first Earth Day activities. They showed that people really did want to do something about the environment. Since then many countries have passed　 5.　　 to protect the air, water, land and animals.

The vehicles such as cars and buses must pass tests to make sure that they don’t cause too　 6.　　　 pollution. Thanks to the laws, cars today release (排放) about half as many bad chemicals as cars did in 1970. As a　 7.　　 , the air is cleaner than it once was.

Rivers and lakes are also cleaner today than before. It’s a good thing. The Cuyahoga River in Ohio was so polluted　 8.　　 rubbish and oil on the river even caught　 9.　　 ! Today, the river is cleaner. It no longer burns. It’s healthy enough for birds, fish, and other animals.

Now the celebration has spread to other countries. More than 175 countries celebrate it each year. We should　 10.　　 our best to help keep our planet healthy.

九年级英语其他题中等难度题查看答案及解析

— Look, Cindy. The flowers in our classroom come out in one night.

— That's fantastic! They are beautiful and colorful. They________ nice.

A.smells B.smell C.sounds D.sound

九年级英语单选题中等难度题查看答案及解析