1 . Scientists have discovered how plants manage to live alongside each other in places that are dark and shady. Plants in the deep darkness of a thick forest, where natural supplies are not very great in amount, won’t attempt to top their neighbors in growth as those in moderate (中度的) shade do. In deep shade conditions, it would be a waste of energy and harmful to survival because green shoots would never be able to top their larger neighbors in growth.
So how do plants prevent such growth in deep shade conditions? The secret lies in the clocks insides them, say scientists from the John Ines Centre and the University of Bristol.
They have discovered that when plants notice deep shade, this changes the expression of genes parts of the circadian clock (昼夜节律时钟) — the inner daily timer found in plants and other things. These clock parts perform an additional role in preventing plants from lengthening and overtopping neighbors.
The work identifies a previously unknown role of the circadian clock in controlling plant development and the findings may have possible effects on both natural plant populations and crops. Professor Antony Dodd of the John Innes Centre said, “The biological clock of plants plays a big part in their development and fitness. This work casts new light on a new role of the circadian clock in adapting plants to competition with other plants in their environments.” “It also gives us new insights into how plants adapt to very deep shade, where resources are very limited,” said Professor Kerry Franklin at the University of Bristol.
This work provides evidence for the firmness of the circadian clock in stressful environments, and information that may be useful in developing new generations of crops in a challenging climate.
1. What do plants normally do in moderate shade?A.Struggle to preserve energy. | B.Compete for limited resources. |
C.Try to outgrow their neighbors. | D.Depend on each other to survive. |
A.By changing their gene expression. | B.By making them realize light change. |
C.By helping them adapt to the darkness. | D.By controlling their growth in deep shade. |
A.To share a new discovery about plants. | B.To introduce the role of the circadian clock. |
C.To explain plants secret of living in forests. | D.To compare plants living in certain condition. |
A.How plants face a challenging climate |
B.Why plants respond to different shade levels |
C.Why the circadian clock is vital to plants' growth |
D.How plants become good neighbors in times of stress |
2 . When I was growing up in Minnesota, Joe Versus the Volcano was one of my favorite movies. I
I had come
It wasn’t long before the airlines canceled all flights. When
For two days, I wandered
Like the people of La Palma, I
As I finally left, I realized how
A.seemed | B.pretended | C.refused | D.longed |
A.recording | B.checking | C.reporting | D.focusing |
A.guessed | B.realized | C.agreed | D.imagined |
A.excited | B.disappointed | C.prepared | D.confused |
A.rock | B.ash | C.lava | D.smoke |
A.covering | B.blocking | C.breaking | D.destroying |
A.managers | B.actors | C.tourists | D.residents |
A.driven | B.forgot | C.cleaned | D.missed |
A.broad | B.beautiful | C.empty | D.crowded |
A.panicked | B.satisfied | C.relaxed | D.inspired |
A.ability | B.chance | C.talent | D.right |
A.studying | B.noticing | C.writing | D.experiencing |
A.relied on | B.appealed to | C.dealt with | D.believed in |
A.lent | B.gave | C.sent | D.sold |
A.upset | B.smart | C.anxious | D.grateful |
3 . Most young people are always on their phones, which may upset many people.
Each teen spent at least an hour of one-on-one time with their oldsters. Based on their
Some of the oldsters actually wanted to take part in e-commerce (电子商务), and needed help to
In addition to arranging group lessons for all of the seniors to
The eighth graders earned their “Silver Award,, for their job. After experiencing the
A.Otherwise | B.Therefore | C.However | D.Besides |
A.service | B.praise | C.invitation | D.donation |
A.keep | B.untie | C.share | D.unlock |
A.technological | B.medical | C.psychological | D.physical |
A.record | B.teach | C.recall | D.investigate |
A.get back | B.set up | C.check out | D.pay off |
A.patience | B.luck | C.fun | D.trouble |
A.write | B.phone | C.text | D.read |
A.sweet | B.simple | C.rare | D.common |
A.play | B.live | C.talk | D.review |
A.amazed | B.experienced | C.confused | D.respected |
A.success | B.arrangement | C.change | D.pressure |
A.performances | B.clinics | C.clubs | D.competitions |
A.organized | B.managed | C.visited | D.funded |
A.needed | B.refused | C.enjoyed | D.deserved |
4 . Dutch artist Daan Roosegaarde’s latest project, GROW, involved installing (安装) thousands of blue, red and purple LED lights in a 2-hectare field of leek (韭菜) for both artistic and practical purposes. People driving by the town of Lelystad, in central Netherlands, at night, this time of year are treated to a fantastic sight—a 20,000 square meters field of leek glowing blue, red and purple. Thought up by Studio Roosegaarde, the unique artistic installation is designed both as an honor to Dutch farmers and as an inspiration for them to experiment with artificial light in outdoor farming. Daan Roosegaarde also wants GROW to send a hopeful light to people in these trying times, giving new meaning to the word “agriculture” as a living cultural artwork.
Nighttime ultraviolet (紫外线的) light has been used in glasshouse agriculture for a while now, especially in places where direct sunlight is scarce, but its use in outdoor fanning has so far been very limited. Ultraviolet light is known to help plants grow better, but Studio Roosegaarde is also testing a theory according to which certain wavelengths of ultraviolet light could reduce the need for pesticides by up to 50%.
“So we started to scan the plants with these wavelengths of light and then suddenly it started to dance, the light,” Daan Roosegaarde said. “You had these huge fields of fireflies, as if they were, and we were testing it and the magic started kicking in, so I think that’s when the worlds of science, art and design meet and enhance each other.” Solar-powered LEDs give ultraviolet light onto the leek plants, thus adding the effect of natural sunlight after sunset, and creating a wonderful sight at the same time.
GROW is currently only visible near Lelystad, but Roosegaarde plans to take the visually-impressive installation on the road to over 40 countries. Each country will have its own local or national crop and its own unique light recipe. Over the years, Studio Roosegaarde has created a number of fascinating installations, like the glow-in-the-dark bicycle path powered directly by the sun.
1. What does GROW probably refer to?A.A project creating artworks. | B.A project installing LED lights. |
C.A project producing pesticides. | D.A project building glasshouses. |
A.Sufficient. | B.Enough. |
C.Steady. | D.Lacking. |
A.What artistic effects were caused by the project |
B.Why the project GROW was conducted. |
C.How Roosegaarde’s design idea came up. |
D.How Roosegaarde’s theory was tested. |
A.It is promising. | B.It is pressing. |
C.It is challenging. | D.It is demanding. |
5 . Women have been making scientific discoveries since ancient times. Twelve women have won the Nobel Prize for Science, one of the highest honors in the world. Some women scientists never married, some worked with their husbands, and others raised large families. It has been difficult for women to be successful scientists.
In the early 1800s in England, Mary Anning became one of the first women recognized for her discoveries about the ancient history of the earth. Mary and her father collected fossils(化石) in their village on the south coast of Great Britain. Fossils are parts of plants or animals that have been saved in rocks for millions of years.
When she was only twelve years old, Mary became the first person to find the almost complete skeletons(骨架) of several animals that no longer existed on the earth.She didn’t become famous for her discoveries at that time because she often sold her fossils to get money to support her family.
In 1891, a young Polish woman named Marie Sklodowska traveled to Paris to study physics. She did so because she could not get a college education in Poland.She began working in the laboratory of a man named Pierre Curie. Marie and Pierre Curie got married and made many discoveries together. They received the Nobel Prize for Physics in 1903 along with another scientist.Marie Curie became the first person to be awarded a second Noble Prize in 1911, this time for Chemistry. Marie Curie was one of the few women at the time who became famous as a scientist.
1. The author believes that women scientists________.A.have more opportunities to become successful |
B.can not get the highest honors in the world |
C.go through difficulties to be successful |
D.had better pay more attention to their families |
A.win the Noble Prize for Science after getting married |
B.make achievements in the study of ancient earth |
C.research animals and their bones |
D.study the mystery of all kinds of plants |
A.She studied physics in Poland and got a college education. |
B.She received the Nobel Prize for Physics in 1903 on her own. |
C.She only got one Nobel Prize during her lifetime. |
D.She made many discoveries after she got married. |
A.Ancient discoveries. | B.Women scientists. |
C.Successful marriages. | D.Different prizes. |
6 . A couple had a son eleven years after they married. They were a loving couple and the boy was the apple of their eye. When the boy was around four years old, one day the father was very tired after work so he asked his wife to pick up their son. The mother, who was very busy in the kitchen, totally forgot about it.
Later the boy lost his way on the street. When the son was found missing, the mother hurried to look for him, but she didn’t find him. The mother felt very sad and didn’t know how to face her husband.
When the father went to the police station after hearing that the son was missing, he looked at his wife and said just four words. What do you think the four words were? The husband just said "I love you, darling."
The son was missing. If he had picked him up earlier, this would not have happened. There is no point in blaming (责备) anyone. His wife had also lost her only child. What his wife needed at that moment was comfort and understanding from her husband. That is what the husband gave his wife. Several weeks later, with the help of the police, the couple finally found their lost son. The family’s relationship became stronger over that time.
Sometimes we spend lots of time asking who is to blame. We miss many chances to give each other support and let each other feel the warmth of human relationships. Get rid of all your unwillingness to forgive, selfishness, and fears and you will find the world is much more wonderful.
1. The underlined part means a person who __________.A.always has a sweet smile | B.is as pretty as an apple |
C.is loved more than anyone else | D.looks like an apple |
A.was very lazy | B.thought the mother had done that |
C.forgot to do so | D.was too tired to do so |
A.Be careful in everything you do. | B.Love is the most important. |
C.Learn to forgive others | D.Everyone can make mistakes. |
A.Warm-hearted. | B.Careful. |
C.Hard-working | D.Broad-minded. |
7 . An infectious disease is a disease that is caused by the invasion of a host by pathogens(病原体)whose activities harm the host’s tissues and can be spread to other individuals.
Microorganisms(微生物)capable of causing disease are called pathogens. A true pathogen is an infectious agent that causes disease in any possible host. The terms “infection” and “disease” are quite different. In order to cause disease, pathogens must be able to enter the host body, stick to specific host cells, invade and multiply and do damage to host tissues.
Pathogens may be spread through either direct or indirect contact. Direct contact occurs when an individual is infected by contact with the infection source. It also includes taking in the infectious droplets released by sneezing or coughing. Indirect contact occurs when a pathogen can survive the environment outside its host for a long period of time. So lifeless objects that are polluted by direct contact with the infection source may be the indirect contact for easily infected group.
Public health measures typically involve killing the pathogen from its source or from its route of spread. Those measures include ensuring a safe water supply, effectively treating waste water, and initiating animal control and vaccination(疫苗)programs, etc. Personally, the first line of defense is to keep pathogen at bay by following good personal hygiene(卫生)habits. Prevent infection before it begins and avoid spreading it to others with some easy measures, such as washing hands, getting vaccinated and so on.
Man never stops fighting against all kinds of infectious diseases. But in the past two decades at least a dozen “new” disease have been identified, and traditional diseases that appeared to be “on their way out” are re-emerging. Globally, infectious diseases remain the leading cause of death. Clearly, the ballet has not been won. Nevertheless, it is increasingly difficult for most of us to deny the claims of science. We are continually presented with great amounts of relevant scientific and medical knowledge, which encourages us to take more responsibility for our own health.
1. What’s the main idea of paragraph2?A.Origin of true pathogens. |
B.Strategies for avoiding tissue damage. |
C.Nature of infectious diseases. |
D.Differences between infection and disease. |
A.Breathing in tiny drops from coughing |
B.Embracing an infected person. |
C.Getting bitten by an infected cat. |
D.Using umbrella a sick man used. |
A.At risk. |
B.Stay away. |
C.Under control. |
D.Within reach. |
A.Science plays an important in defeating infectious diseases. |
B.Man is at a loss about infectious diseases. |
C.Traditional infectious diseases are dying out. |
D.The battle against infectious diseases is in vain. |
8 . Road traffic crashes kill 1.25 million people each year worldwide. The statistics are part of the “Global Status Report on Road Safety 2015”. The report surveyed 180 countries, and it shows the number of annual deaths from traffic crashes is stabilizing(稳定).And that is good news as the number of motor vehicles grow worldwide. But the data also show that road crashes are the NO.1cause of death among young people aged 15 to 29. Young adults around the world are the worst driving risks. Even in the U.S..drivers aged 15 to 24. account for about 30 percent of all driving-elated accidents .But the World Health Organization(WHO) says they are preventable.
The WHO report also finds a big gap in road safety and deaths between poor and rich countries Poor countries have only 54 percent of the world’s vehicles. But those countries have some of the worst safety statistics in the report. “Africa has only two percent of the world’s vehicles, but has the highest death rate on the road,” says Etienne Krug. The head of the WHO Department of Non-communicable Diseases. Sweden, the Netherlands and the United Kingdom are leaders in preventing traffic deaths.
Stronger road safety laws and stricter vehicle safety requirements in developing countries would prevent many accidents .Laws can quickly influence driving behavior. In only three years. 17 countries became safer by putting tougher road safety laws into effect. Some of those laws include banning drunk driving ,requiring cyclists and motorcycle drivers to wear helmets and making safety belts mandatory(强制性的)in all vehicles. Good injury care after a crash can cut the number of deaths from road injuries in half. Of course, there are also many other ways to make roads safer.
1. What does the underlined word “they” in Paragraph 1 refer to?A.Motor vehicles | B.The statistics |
C.Traffic crashes | D.Young drivers |
A.People in developed countries are very skilled at driving. |
B.Africa has to take some measures to prevent traffic deaths. |
C.The Netherlands has done the best in avoiding traffic accidents. |
D.Poor countries need to buy fewer cars to reduce traffic accidents. |
A.Suggestions on good injury care. |
B.More ways to make roads safer. |
C.The number of deaths from accidents. |
D.Other road safety laws in poor countries. |
A.The danger of driving alone. |
B.The ways to avoid road accidents. |
C.The No.1 killer among the youth. |
D.The importance of helmets in driving cars. |
9 . I went to a small and poor elementary school. I remember the first time a computer showed up in class. It was 5th grade and the computer was an Apple. It was the only computer in my school. This was the 80s and it was a $2600 machine.
Before I discovered computers, I took typing class on old typewriters and I was the kid in class that repaired the typewriters. I remember spending hours trying to figure out what each typewriter needed to fix a stuck key. I was also the Audio/Visual geek (狂热的人). This meant I was the only one in the class who can thread (穿过)film onto the projector.
Anyway, when this Apple showed up, I immediately opened it. I had to see what was inside. This totally freaked out the teacher but it seemed clear I wasn't going to break it. I quickly learned how to get out of educational games and write things in BASIC. This was all in 5th grade.
I and my 5th grade teacher stayed in touch until her passing. I honestly don't know what I'd be doing if she hadn't done something extraordinary. She let my father and me took the Apple home. I'd spend the weekend programming, reading the massive notebooks. This was a $ 2000+computer in the middle of the 80s — the pride of the school —and they let me take it home. A year later, I came home from school one day and the family car was gone and there was a Commodore 64 left in its place. My parents had sold the car and bought a Commodore.
Now, I think about this crazy journey. I am standing on the shoulders not only of computer science giants, but also heroes like my parents and my 5th grade teacher. Thanks Mrs. Hill, for introducing me to computers even though you were breaking rules. Thanks, Mom and Dad, for bringing a computer home even when there wasn't money for one.
1. What can we learn about the author from paragraph 2?A.He was a hard-working student. |
B.His family was too poor to buy him a computer. |
C.He had already had some skills to operate a computer. |
D.He was one of the clever ones who could handle a computer. |
A.Frightened. | B.Interested. | C.Amused. | D.Annoyed. |
A.Thoughtful. | B.Grateful. | C.Relaxed. | D.Anxious. |
A.Why We Need Computers | B.How I Learned to Use a Computer |
C.How I Got My First Computer | D.Thanks For Giving Me a Computer |
10 . In Germany, it’s not a necessity to wear school uniform at school. But why did a few schoolmates and I spend two days
It is a conference
The
Not only was the conference a
I’d really
A.talking | B.thinking | C.wandering | D.debating |
A.intended | B.provided | C.celebrated | D.known |
A.visit | B.manage | C.defend | D.represent |
A.ages | B.schools | C.classes | D.countries |
A.summary | B.report | C.passage | D.settlement |
A.theme | B.purpose | C.plan | D.course |
A.informs | B.responds | C.guarantees | D.means |
A.give up | B.focus on | C.bring up | D.break into |
A.beside | B.beyond | C.between | D.behind |
A.changed | B.attracted | C.concerned | D.bothered |
A.possibility | B.challenge | C.conversation | D.chance |
A.Tricky | B.Discouraging | C.Interesting | D.Useful |
A.show | B.result | C.practice | D.example |
A.avoid | B.consider | C.imagine | D.recommend |
A.ideas | B.troubles | C.sufferings | D.feelings |