When a leafy plant is under attack, it doesn’...

When a leafy plant is under attack, it doesn’t　 sit quietly. Back in 1983, two scientists, Jack Schultz and Ian Baldwin, reported that young maple trees getting bitten by insects send out a particular smell that neighboring plants can get. These chemicals come from the injured parts of the plant and seem to be an alarm. What the plants pump through the air is a mixture of chemicals known as volatile organic compounds, VOCs for short.

Scientists have found that all kinds of plants give out VOCs when being attacked .It’s a plant’s way of crying out. But is anyone listening? Apparently. Because we can watch the neighbours react.

Some plants pump out smelly chemicals to keep insects away. But others do double duty. They pump out perfumes designed to attract different insects who are natural enemies to the attackers. Once they arrive, the tables are turned. The attacker who was lunching now becomes lunch.

In study after study, it appears that these chemical conversations help the neighbors .The damage is usually more serious on the first plant, but the neighbors, relatively speaking, stay safer because they heard the alarm and knew what to do.

Does this mean that plants talk to each other? Scientists don’t know. Maybe the first plant just made a cry of pain or was sending a message to its own branches, and so, in effect, was talking to itself. Perhaps the neighbors just happened to “overhear” the cry. So information was exchanged, but it wasn’t a true, intentional back and forth. Charles Darwin, over 150 years ago, imagined a world far busier, noisier and more intimate(亲密的) than the world we can see and hear. Our senses are weak. There’s a whole lot going on.

1.What does a plant do when it is under attack?

A.It makes noises. B.It gets help from other plants.

C.It stands quietly D.It sends out certain chemicals.

2.What does the author mean by “the tables are turned” in paragraph 3?

A.The attackers get attacked.

B.The insects gather under the table.

C.The plants get ready to fight back.

D.The perfumes attract natural enemies.

3.Scientists find from their studies that plants can ________.

A.predict natural disasters

B.protect themselves against insects

C.talk to one another intentionally

D.help their neighbors when necessary

4.What can we infer from the last paragraph?

A.The world is changing faster than ever.

B.People have stronger senses than before

C.The world is more complex than it seems

D.People in Darwin’s time were imaginative.

高一英语阅读理解中等难度题查看答案及解析

Only ______ a human being.

A.when is it hungry a lion will attack B.when it is hungry a lion will attack

C.when it is hungry will a lion attack D.when is it hungry will a lion attack

高一英语单项填空简单题查看答案及解析

It is every citizen's duty to _____ our country when she is attacked by the enemy．

A．approach           B．defend             C．support      D．preserve

高一英语单项填空简单题查看答案及解析

It is every citizen's duty to _____ our country when she is attacked by the enemy．

A．approach       B．defend         C．support           D．preserve

高一英语单项填空中等难度题查看答案及解析

Animals are different from plants ________ they can move when they are attacked by others.

A. where 　　　　　　　　 B. in which

C. for which　　　　　　 D. in that

高一英语单项填空中等难度题查看答案及解析

It is important to learn to take a positive attitude_____ life when you are ___ trouble.

高一英语单项填空中等难度题查看答案及解析

When a child sits down in front of a computer, it is not only the material he views but the length of time he spends on computer that can influence his total social, physical and mental well-being. 1.

Computer Use and a Child’s Physical Well-being

Excessive (过多的) screen time is harmful to a child’s health. 2. Staring at a bright computer screen for hours on end can cause nearsightedness and eye focusing problem.

Computers VS. Active Play

3. Perhaps the greatest concern about the overuse of computers in homes and in schools is that it interferes with a child’s active playtime. Active play is necessary for overall physical health and greatly reduces the risk of childhood obesity.

Computers as Learning Tools

When used in moderation, computers are still useful tools for learning. 4. Thanks to the Internet, kids are writing more than ever. For the first time, children are spending time writing detailed reviews of radio games and movies.

Practice Computer Safety

To make sure computers are helping and not harming your children, reduce glare on the computer. 5. A computer is a useful tool only when used in moderation.

A. However, with computers, moderation is key.

B. Active play is important for a child’s development.

C. The greatest physical risk of too much computer use is eyestrain.

D. Computers help kids better understand visual images like diagrams.

E. Carefully monitoring computer use can be a great way to promote a child’s learning.

F. Don’t forget to install child safety software so children don’t come across dangerous websites.

G. Too much computer time, even on “Educational sites,” can have a negative influence on a child’s overall health.

高一英语七选五简单题查看答案及解析

Newton was sitting under an apple tree ______ an apple fell onto his head.

高一英语单项填空中等难度题查看答案及解析

It’s a classroom. Instead of being told to sit quietly and listen, you are encouraged to stand up, jump around, imagine and act out. It’s a class full of laughter and applause (鼓掌), emotion and energy. Welcome to drama class, one of my favorite classes at high school.

In drama class we used to play a lot of “drama games”. We would improvise (即兴表演), copy and above all use our imagination.

My favorite game was called “Spotto”. One person stood in the front of the class and performed a scene, completely out of their imagination. When one audience member yelled “Spotto!”, the performer had to freeze. Then the person who had yelled Spotto had to get up and improvise a new scenario (剧情) based on the position the first performer froze in. This went on as more and more people were added to the scene. Eventually the entire class would have joined the scene. Then the performers would start to leave in reverse (颠倒的) order.

It was a lot of fun, and a good test of everyone’s imagination to see what they would come up with. Drama class at my school often involved a big performance at the end of the term as well. We would work on a production throughout the term and put on a show for our parents and the school community.

It was a great experience to perform on stage in front of a large audience. Drama class can help shy children, like me, to come out of their shells. It helped them become more confident and developed their public speaking skills. Drama class is also a great place to express oneself, and a way for children to use up some of their energy.

1.Which do you agree with about the game “Spotto”？

A. Each performer in the game has to retell the story of the latter performer.

B. A performer has to show a story unrelated to that of the former performer.

C. Every student gets the chance to make a contribution to the “Spotto” game.

D. It is designed to help drama students learn from one another’s performance.

2.The underlined word “them” in the last paragraph refers to “　　　　 ”.

A. shy children　　 B. a large audience　　 C. drama students　　 D. the whole class

3.What do you know about the author according to the article?

A. He was too shy to attend the drama class.

B. He was a star student in the drama games.

C. He was shining in big performances each term.

D. He was happy to perform on stage in front of the audience.

4.What’s the best title for this passage?

A. A few drama games for fun.

B. How to improve drama skills.

C. Unforgettable experiences on stage.

D. One of my favorite high school courses.

高一英语阅读理解中等难度题查看答案及解析

When a child is told he is "uncool", it can be very painful. He may say he doesn't care, and even act in ways that are opposite of cool on purpose. But ultimately, these are simply ways to handle sadness by pretending it's not there.

Helping a child feel better in school had to be careful. If you say, "Why are you worried about what other children think about you? It doesn't matter!" children know that it does matter. Instead, an active way may be best. You could say, "I'm going to do a couple of things for you to help you feel better in school."

If a boy is having trouble making friends, the teacher can help him. The teacher can arrange things so that he has chances to use his abilities to contribute to class projects. This is how the other children learn how to value his good qualities and to like him. A teacher can also raise a child's popularity in the group by showing that he values that child. It even helps to put him in a seat next to a very popular child, or let him be a partner with that child in activities, etc.

There are things that parents can do at home, too. Be friendly when your child brings others home to play. Encourage him to invite friends to meals and then serve the dishes they consider "super". When you plan trips, picnics, movies, and other shows, invite another child with whom your child wants to be friends.

What you can do is to give him a chance to join a group that may be shutting him out. Then, if he has good qualities, he can start to build real friendship of his own.

1.A child who has been informed of being "uncool" may _____.
A.care nothing about it

B.develop a sense of anger
C.do something uncool purposely

D.pretend to get hurt very much

2.A teacher can help an unpopular child by _____.
A.seeing the child as the teacher's favourite
B.asking the child to do something for partners
C.forcing other children to make friends with the child
D.offering the child chances to show his good qualities

3.How can parents help their child fit in better?
A.By cooking delicious food for him.

B.By being kind to his schoolmates.
C.By forcing him to invite friends home.

D.By taking him to have picnics in the park.

4.Which of the following is TRUE?
A.Children don't care about others' comments on them.
B.It's only a teacher's work to make children popular.
C.Parents should take their children out for picnic and shows more often.
D.Inviting children's friends to family activities is good for them to make friends.

高一英语阅读理解中等难度题查看答案及解析