A new study finds that plants communicate with one another to warn of danger.We

A new study finds that plants communicate with one another to warn of danger.We

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A new study finds that plants communicate with one another to warn of danger.
We often consider plants as the furniture of the natural world. They don’t move; they don’t make sounds, they don’t seem to act on anything. But as is often the case, plants talk to each other all the time. And the language is chemical.
Over the years, scientists have reported that different types of plants, from trees to tomatoes, give out chemicals into the air to help neighboring plants. These chemical warnings can spread information about one plant’s disease or infestation(虫害), so other plants can protect themselves. But how plants receive and act on many of the information exactly is still mysterious.
In this week’s Science Magazine, researchers in Japan offered some explanations. They have found out one chemical message and traced it all the way from beginning to end.
The scientists looked at tomato plants infested by a common pest(害虫). To start out, they grew plants in two separate plastic spaces connected by a tube(管子). One plant was infested and placed upwind and the other was uninfested and placed downwind. The downwind plants were later exposed(暴露) to the pest. The results showed that plants near sick neighbors before were able to protect themselves better against the pest.
They found one chemical appeared more often in the exposed plants. The chemical is called HexVic. The scientists discovered where HexVic come from, and put it over healthy plants. Those plants were then able to produce HexVic. Researchers made sure that uninfested plants could fight off bugs and diseases. How do they know when to protect themselves? They are warned first by their friendly plant neighbors.
It is not a simple story, and it may be happening in more plant species than tomatoes. It may also be happening with more chemical signals that are still unknown to us. In a word, we know that plants not only communicate, but also look out for one another.
小题1:The underlined “traced” in the fourth paragraph probably means _________ here.
A.reportedB.followed
C.doubtedD.developed
小题2:For scientists, which are the right steps to watch tomato plants infested by a pest?
①  Place the infested plant upwind.
②  Place the uninfested plant downwind.
③  Expose the downwind plants to the pest.
④  Grow plants in two separate plastic spaces connected by a tube.
A.③①②④B.①④③②
C.④①②③D.④②①③
小题3:You can put the sentence “The researches also studied leaves from exposed plants and unexposed plants.” At the beginning of
A.Paragraph 3B.Paragraph 4
C.Paragraph 5D.Paragraph 6
小题4:Which of the following can be the best title of this passage?
A.Communicating Plants and Terrible Diseases
B.Talking Plants and Friendly Warnings
C.Protecting Plants and Clear Information
D.Growing Plants and Mysterious Chemicals

答案

小题1:B
小题2:C
小题3:D
小题4:B
解析

试题分析:本文叙述了一项新的研究发现植株之间交流是危险的警告。植株之间的交流就是一种化学物质。科学家观察了害虫在植株上滋生的过程,发现在被害虫感染的植株上有一种化学物质HexVic.这种物质放在健康的植株上,也会产生这些物质。因此要确保植株健康,首先要有友好的邻居。总之,植株之间不仅交流,而且要互相小心。
小题1:词义猜测题。根据 all the way from beginning to end.可知此处从头到尾一直在跟踪,故选B。
小题2:细节理解题。根据To start out, they grew plants in two separate plastic spaces connected by a tube(管子). One plant was infested and placed upwind and the other was uninfested and placed downwind. The downwind plants were later exposed(暴露) to the pest.可知科学家观察害虫在植株上滋生的步骤为:首先他们在两个由管子连接独立的塑料空间种上植株,一棵植株被感染上害虫,放在迎风的地方,另一棵植株没有被感染,被放在顺风的地方。不久顺风地方的植株也暴露在害虫面前。故选C。
小题3:推理判断题。根据They found one chemical appeared more often in the exposed plants. 可知他们在被暴露的植株上发现了一种化学物质,故在此之前应是科学家把被暴露的植株和没被暴露的植株进行比较,才会发现他们之间的差别。因此这句话应出现在第6段。故选D。
小题4:标题归纳题。根据A new study finds that plants communicate with one another to warn of danger. 可知本文是围绕着对植物之间互相交流带来的危险警告。故选B。
举一反三
Bikes are popular in the Dutch(荷兰). In fact, nearly half of all travel in the Dutch is by bike. Now, one Dutch bike designer(设计师), Thomas, has taken the country’s interest in bikes by making a school bus bike.
The big bike has eight sets of pedals(踏板) for kids, a driver seat for an adult, and three other seats, comfortably letting little kids for their trip to and from school. The bike even has a motor, which can help with high hills or at times when few kids on it.
So far, Thomas tells Fast Company, he’s sold 25 school-bikes, at a price of $ 25,000 each—less than it would cost to buy a traditional school bus with the same number of seats. Along with the traditional color, the bikes ,are colored yellow so that they can be seen easily.
Thomas says he’s sold school bus bikes to neighboring countries such as Belgium, England and Germany, but so far, the school bus bike hasn’t been sold in the United States. If the U.S. agrees to buy this kind of school bus bike, it could do a lot of good to improve exercise for a young age and help them keep healthy.

小题1:How do people in the Dutch usually go to work?
A.By car.B.By bus.
C.By bike.D.On foot.
小题2:How many seats does the school bus bike have?
A.Three.B.Eight.
C.Nine.D.Twelve.
小题3:The school buses are yellow in the Dutch because _______.
A.the color yellow is easy to paint
B.yellow buses can be seen easily
C.yellow is the national color of Dutch
D.it’s the designer’s favorite color
小题4:Which country of the following hasn’t bought a school bus bike?
A.America.B.Germany.
C.England.D.Belgium.
小题5: Which of the following is TRUE?
A.Thomas made a new kind of school bus.
B.A school bus usually costs $ 25,000.
C.Thomas sold bikes to Asian countries.
D.Riding school bus bikes helps keep kids healthy.

题型:不详难度:| 查看答案
Why do we like drinking water from plastic bottles? Some people think it is healthy and clean. Others drink bottled water because it’s easy — you can carry it around with you. In hot countries, like Greece, we often buy bottles of cold water in the summer.
However, making lots of plastic is not a good idea for many reasons. First of all, we need a lot of oil for plastic products. We usually use oil as a source(资源) of energy. If we reduced the number of bottles we made, we wouldn’t need so much oil. Plastic bottles also pollute the environment. If we recycled all our plastic bottles, we wouldn’t need so much space for rubbish dumps. But in Greece, we don’t recycle much of the plastic we use. In 2006, Greeks recycled only about 10% of plastic waste. The rest became rubbish on land and in rivers and sees. So next time you want to throw away a plastic bottle in the litter bin, stop and think. If you recycled it, you would help the environment. But what can you do when there isn’t a recycling bin near you? Well, there are loes of useful ways that you can use your bottles again. For example, an empty bottle makes a great piggy bank for your pocket money, and if you cut a bottle in half, you will have a plant pot. Go green! You can make a difference.
小题1:What is not mentioned about bottled water in this passage?
A.It’s healthy. B.It’s clean.
C.It’s easy. D.It’s expensive.
小题2:Plastic products are made from         .
A.energy B.oil
C.rubbish D.plants
小题3:        of plastic waste became rubbish in Greece in 2006.
A.10% B.50% C.80% D.90%
小题4: Which is the best way to deal with used plastic bottles?
A.To recycle them. B.To make a piggy bank.
C.To make a plant pot. D.To drop them into the river.
小题5: The underlined part in this passage tells us “       ”.
A.To make a different life, you’d better go outside.
B.To look different, you’d better wear green clothes.
C.To protect the environment, you can do something.
D.To go green, you should use plastic products.

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Do you know why so many animals do not stay in one place? Birds, fish and other animals move from one place to another place at a certain time. They move for different reasons: most of them move to find food more easily, but others move to get away from places that are too crowded.
When cold weather comes, many birds move to warmer places to find food. Some fishes give birth in warm water and move to cold water to feed. The most famous migration is probably the migration of fish, which is called “salmon”(鲑鱼). This fish is born in fresh water but it travels many miles to salt water. There it spends its life. When it is old, it will return to its birthplace in fresh water. Then it gives birth and dies. In northern Europe, there is a kind of mouse. They leave their mountain homes when they become too crowded. They move down to the low land. Sometimes they move all the way to the seaside, and many of them are killed when they fall into the sea.
Recently, scientists have studied the migration of a kind of lobster(龙虾). Every year, when the season of the bad weather arrives, the lobsters get into a long line and start to walk across the floor of the ocean. Nobody knows why they do this, and nobody knows where they go. So, sometimes we know why humans and animals move from one place to another place, but at other times we don’t. Maybe living things just like to travel.

小题1:The reason for most of the animals to move is ________.
A.to get away from un-crowded placesB.to find their own parents
C.to want to kill themselvesD.to find food more easily
小题2:Where does young salmon(鲑鱼) spend its life?
A.In fresh water.B.In salt water.
C.In mountain homes.D.In its birthplace.
小题3: When do the lobsters(龙虾) begin to move another place?
A.When their homes become too crowded.
B.When the season of the bad weather arrives.
C.When they want to give birth.
D.When their food is eaten up.
小题4: The underlined word migration in the passage means ________.
A.迁徙B.习性
C.运动D.寻觅

题型:不详难度:| 查看答案
One day I got into a taxi and we took off for the airport.
We were driving in the right way when suddenly a black jeep jumped out of a parking space right in front of us. My taxi driver had to stop the car at once, and missed the other car by just inches! The driver of the other car started shouting at us. My taxi driver just smiled and waved at the guy, and I mean, he was really friendly.
So I asked, “Why did you just do that? This guy almost destroyed your car and sent us to the hospital!” This is when my taxi driver taught me what I now call, “The Law of the Garbage Truck(垃圾车).”
He explained that many people are like garbage trucks. They run around full of garbage, full of anger(愤怒). As their garbage gets more, they need a place to dump it and sometimes they’ll dump it on you. Don’t take it seriously. Just smile, wave, wish them well, and move on. Don’t take their garbage and pass it to other people at work, at home, or on the streets.
Life’s too short , so...
小题1:Which is the correct order of the events that took place in the story?
a. I took a taxi to the airport.
b. The driver of the other car shouted at us.
c. A black jeep suddenly jumped right in front of us.
d. Our taxi nearly crashed into the other car.
e. My taxi driver taught me the law.
f. My taxi driver smiled and waved.
A.a-e-b-d-f-cB.b-a-e-d-c-f
C.a-c-d-b-f-eD.f-e-a-c-d-b
小题2:The writer’s purpose in writing the story is to______.
A.share the terrible ride with us
B.tell us how to drive safely
C.show us how great the taxi driver is
D.show us how to deal with life more wisely
小题3:The paragraph following the passage will be about           .
A.the writer will never forget the taxi driver
B.the writer will become a good and friendly taxi driver, too
C.the writer will be better at dealing with anger in his life
D.the writer will be always friendly to others

题型:不详难度:| 查看答案
If you’ve tried studying when you’re tired, you know that it can seem very impossible to do well.
A study of sleep in sparrows suggests the relationship between sleep and the ability to learn may be more complicated(复杂) than people knew.
Niels C·Rattenborg, a scientist from Wisconsin-Madison, wanted to find out how the sparrows were able to deal with getting so much less sleep. He and his team brought eight wild birds into a lab and watched them for one year. They invented a game to check how well the birds could learn. In the game, the sparrows had to peck(啄)three buttons (按钮)in a right order to get a food treat. The scientists discovered that the birds’  ability to learn the right button order depended on(依靠)two things: the time of year and the amount of sleep the birds had had.
During the migration(迁徙)season, the sparrows were restless at night and got much less sleep than usual. Even so, they were able to understand how to get the food quickly as if they’d had a regular night of sleep. Outside the migration season, they found the sparrows that got less sleep than usual had much more difficulty learning how to get the food treats than birds that had a regular sleep.
The results show that the sparrows can deal with much less sleep during the migration season than usual. If scientists can find out why, they may learn from sparrows and find ways of helping people deal with getting much less sleep. Until scientists fully understand the relationship between sleep and learning, it’s better to get plenty of sleep when preparing for an exam.
小题1:The passage is mainly about          .
A.sparrows’ migration.
B.sleep lessons from Sparrows.
C.how to get less sleep while studying
D.how sparrows that got less sleep get food treats
小题2:Why can sparrows get much less sleep during the migration season?
A.They eat more.
B.The climate is better
C.They can get food quickly
D.Scientists still don’t know the reason.
小题3:What fact does the passage lead you to believe?
A.We should sleep as little as sparrows do.
B.We should get enough sleep before an exam.
C.When tired, we should try to focus on(聚焦) our study.
D.When tired, we should check how we can sleep less than usual.

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