阅读理解。 A team of Japanese scientists has discovered genes that enable rice to - 高中英语试题 - 超级试练试题库

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阅读理解。     A team of Japanese scientists has discovered genes that enable rice to survive high water, providing
hope for better rice production in lowland areas that are affected by flooding.
     The genes, called SNORKEL genes, help rice grow longer stems to deal with higher water levels.
Deepwater rice generally produces low-yield (低产的) rice plants. But the researchers report they have
succeeded in introducing the genes to rice varieties that are higher-yield.
     According to the report, as water levels rise, accumulation of the plant hormone (激素) ethylene
(乙烯) makes the SNORKEL genes start working, making stem growth more rapid. When the
researchers introduced the genes into rice that does not normally survive in deep water, they were able
to rescue the plants from drowning.
     Motoyuki Ashikari, who headed the project, said his team is-hoping to use the gene on long grain
rice widely used in Southeast Asian to help stabilize production in flood-prone (易受洪水袭击的)
areas where rice with the flood-resistant gene is low in production ---about one---third to one-quarter
that of regular rice.
    " Scientifically, the gene that we found is rare but clear proof of a biological ability to adapt to a harsh
environment," he said. "It"s a genetic strategy specifically to survive flooding."
    High water levels in rice field can be a serious problem. In some areas, rains can cause water levels
to rise dangerously high during the growing season and flash flooding can fully submerge plants for days
or even weeks.
    Rice is a main food for billions, and while productivity has increased dramatically since the 1960s,
yields must be doubled to meet projected requirements by 2050. More than 30 percent of Asian and
40 percent of African rice land is either lowland field or deepwater field.
    Laurentius of Utrecht University said the study is significant because high-yield rice varieties cannot
survive extremes of floods. "The introduction of these genes into high-yield varieties, using advanced
breeding strategies, promises to improve the quality and quantity of rice," he said.1. What is the main character of SNORKEL genes?   A. They prevent rice from being attacked by various diseases.
B. They help rice grow taller in highland regions.
C. They make rice grow tall enough to survive in deep water.
D. They make rice be ripe within a shorter time.2. According to Ashikari, the rice with the gene his team found ______.A. will be helpful for Southeast Asia
B. has been widely used in Southeast Asia
C. will be one third more expensive than regular rice
D. is lower in production than regular rice3. The underlined word"submerge"in the sixth paragraph probably means _____. A. cover
B. damage
C. produce
D. kill4. What Laurentius said in the last paragraph suggests that_____.A. rice will be planted on the farmland everywhere in the future
B. rice with SNORKEL genes will be of high quality in the future
C. high-yield rice varieties are not common nowadays
D. the quality of rice is difficult to improve

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1-4: CAAB

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试题【阅读理解。 A team of Japanese scientists has discovered genes that enable rice to】；主要考察你对题材分类等知识点的理解。[详细]

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完形填空。     How men first learnt to invent words is unknown;     1   ,the origin of language is a mystery. All we
really know is that men,   2    animals, somehow    3   certain sounds to express thoughts, actions, and
things,    4   they could communicate with each other; and that later they agreed    5   certain signs,    6
  letters, which could be combined to represent those sounds, and    7 could be written down. These
sounds,    8   spoken, or written in letters, we call words. The    9   of words, then, lies in their associations-the things they bring up before our minds. Words become filled with    10   for us by experience.    11   we live, the more certain words recall to us the glad and sad events of our    12   and the more we read
and learn, the more    13   words that mean something to us increases. Great writers are those    14   not
only have great thoughts but also    15   these thoughts in words which appeal powerfully to our minds
and emotions. This charming and telling use of words is   16    we call literary style. Above all, the real poet
is a matter of    17   . he can convey (传达) his meaning in words which sing like music, and which by their position and association can    18   men to tears. We should therefore learn to    19   our words carefully
and use them accurately,    20   they will make our speech silly and vulgar (粗俗的).

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( )1. A. in other words ( )2. A. unlike ( )3. A.discovered ( )4. A.unless ( )5. A.to ( )6. A. formed ( )7. A. what ( )8. A. whether ( )9. A. energy ( )10. A. sounds ( )11. A.The longer ( )12. A. past ( )13. A.a number of ( )14. A.who ( )15. A.say ( )16. A.what ( )17. A.thoughts ( )18. A.move ( )19. A.elect ( )20. or	B. word for word B. like B. found B. so that B. with B. spoken B. which B. neither B. force B. pronunciation B. Long B. present B. the number of B. that B. write B. how B. himself B. let B. select B. and	C. in a word C. as C. created C. as if C. upon C. written C. whom C. either C. power C. structure C. Longer C. now C. the number C. what C. explain C. why C. words C. get C. decide C. so	D. in word D. with D. invented D. in case D. at D. called D. as D. if D. strength D. meanings D. The long D. future D. numbers of D. they D. express D. which D. poems D. make D. choose D. but
阅读理解。
A new plan for getting children to and from school is being started by a local government in Eastern England. This could end the worries of many parents fearful for their children"s safety on the roads. Until now the local government have been prepared to provide bus services for children living more than three miles from their school, or sometimes less if special reasons existed. Now it has been decided that if a group of parents ask for help in organizing transport they will be prepared to go ahead, as long as the arrangement will not lose money and children taking part will be attending their nearest school. The new plan is to be fired out this term for children living at Milton who attend Impington School. The children live just within the three-mile limit and the local government said in the past that they would not undertake to provide free transport to the school. But now they have agreed to offer a sum of money for a bus service from Milton to Impington School and back, a plan which has the support of the school"s headmaster. Between 50 and 60 parents have said they would like their children to take part. Final calculations have still to be carried out, but a government official has said the cost to parents should be less than ?20 a term. They have been able to arrange the service at a low cost because there is already an agreement with the bus company for a bus to take children who live further away to Impington. The same bus would now just make one more journey to pick up the Milton children. The official said they would get in touch with other groups of parents who in the past had asked if transport could be provided for their children, to see if they would like to take part in the new plan.
1. What is the aim of the plan?
A. To prevent the students" road accident. B. To relieve the traffic pressure. C. To save time for the parents and students. D. To help the parents save money
2. How can the local government arrange the new bus service at a low cost?
A. By letting the bus run in the morning only. B. By limiting the number of the students. C. By getting the support from the headmaster. D. By linking(连接) the new bus service with the existing one.
3. Which of the following is possible if the plan is carried out?
A. The bus company will make much more money. B. The children can choose whatever school they like. C. The parents can get rid of their worries. D. The students in Impington school can have free bus rides.
4. This passage is most probably ______.
A. a personal letter B. an advertisement C. a headmaster"s report D. a newspaper article
阅读理解。
Grown-ups know that people and objects are solid. At the movies, we know that if we reach out to touch Tom Cruise, all we will feel is air. But does a baby have this understanding? To see whether babies know objects are solid, T.Bower designed a method for projecting an optical illusion (视觉影像) of a hanging ball. His plan was to first give babies a real ball, one they could reach out and touch, and then to show them the illusion. If they knew that objects are solid, and they show surprise in their faces and reach out for the illusion and found empty air, they could be expected movements. All the 16-to 24-week-old babies tested were surprised when they reached for the illusion and found that the ball was not there. Grown-ups also have a sense of object permanence. We know that if we put a box in a room and lock the door, the box will still be there when we come back. But does a baby realize that a ball that rolls under a chair does not disappear or go to never-never land? Experiments done by bower suggest that babies develop a sense of object permanence when they are about 18 weeks old. In his experiments, Bower used a toy train that went behind a screen. When 16-week-old and 22-week-old babies watched the toy train disappear behind the left side of the screen, they looked to the right, expecting it to reappear. If the experimenter took the train off the table and lifted the screen, all the babies seemed surprised not to see the train. This seems to show that all the babies had a sense of object permanence. But the second part of the experiment showed that this was not really the case. The researcher substituted (替换) a ball for the train when it went behind the screen. The 22-week-old babies seemed surprised and looked back to the left side for the train. But 16-week-old babies did not seem to notice the switch (更换). Thus, the 16-week-old babies seemed to have a sense of "something permanence," while the 22-week-old babies had a sense of object permanence related to a particular object.
1. The passage is mainly about ______.
A. babies" sense of sight B. effects of experiments on babies C. babies" understanding of objects D. different tests on babies" feelings
2. In Paragraph 3, "object permanence" means that when out of sight, an object ______.
A. still exists B. keeps its shape C. still stays solid D. is beyond reach
3. What did Bower use in his experiment?
A. A chair B. A screen C. A film D. A box
4. Which of the following statements is true?
A. The babies didn"t have a sense of direction. B. The older babies preferred toy trains to balls C. The younger babies liked looking for missing objects. D. The babies couldn"t tell a ball from its optical illusion.
阅读理解。
"Life is speeding up. Everyone is getting unwell." This may sound like something someone would say today. But in fact, an unknown citizen who lived in Rome in 52 wrote it. We all love new inventions. They are exciting , amazing and can even change our lives. But have all these developments really improved the quality of our lives? Picture this: You"re rushing to finish your homework on the computer. Your mobile phone rings, a QQ message from your friend appears on the screen, the noise from the television is getting louder and louder. Suddenly the computer goes empty and you lose all your work. Now you have to stay up all night to get it done. How calm and happy do you feel? Inventions have speeded up (加速) our lives so much that they often leave us feeling stressed (压力) and tired. Why do you think people who live far away from noisy cities, who have no telephones, no cars, not even electricity often seem to be happier? Perhaps because they simpler lives. On e family in the UK went "back in time" to see what life was like without all the inventions we have today. The grandparents, with their daughter, and grandsons Benjamin, 10, and Thomas,7, spent nine weeks in a 1940s house. They had no washing machine, microwave, computer or mobile phones. The grandmother, Lyn, said, "It was hard physically, but not mentally." She believed life was less materialistic. "The more things you have , the more difficult life becomes." She said. The boys said they found less to fight over, such as their computer. Benjamin also noticed that his grandmother had changed from being a trendy, beer-drinking granny, to one who cooked things. Here are some simple ways to beat the stress often caused by our inventions! Don"t be available all the time. Turn off your mobile phone at certain times of the day. Don"t check your e-mail every day. Don"t reply to somebody as son as they leave a text message just because you can. It may be fun at first, but it soon gets boring.
1. The passage is mainly about_______.
A. problems with technology B. improvements of our life with technology C. the important roles technology plays in our everyday life D. major changes which will be likely to happen to technology
2. The writer quoted( 引用) what a citizen in ancient Rome said at the beginning of the story in order to _______.
A. share a truth about life B. tell us what life was like long time ago C. make us wonder what causes such a thing to happen D. point out that you experience some big problems and they may be the same
3. The family chose to spend some time in a 1940"s house because ______.
A. they liked to live simple lives B. they were curious about how people lived without modern inventions C. they were troubled by modern inventions D. living in a different time would be a lot of fun for them
4. What do you think the underlined word "available" in the first suggestion offered by the writter means?
A. Busy on line B. Free C. Able to be used D. Able to be found by others
阅读理解。
To be sure, only children experienced some things differently from those with sisters and brothers. Many feel more pressure to succeed. They also tend to look only to their parents as role models in the absence of brothers and sisters. In India, 10-year-old Saviraj Sankpal founded a support group for the tiny minority of only children. Among other things, the group does volunteer work to counter (反对) the myth that they are not responsible. "People think we"re treated too kindly and ruined," says Sankpal, a computer engineering students. "But I"d like to remind them how lonely it can get." Most only children, however, say they wish for sisters or brothers only when it comes to caring for aging, unhealthy parents. Britain"s David Emerson, co-author of the book The Only Child, says that such a person bears terrible burden in having to make all the decisions alone. Emerson knows from experience: After his father died, he chose to move his elder mother from their family home, where she was vulnerable (易受攻击的)to house breakers, to a new one with more security. "The move was quite hard on her, and she might feel that I pushed her into it," he says. "After all, I am left with that responsibility." In the future, more and more only children will likely face similar choices. With working mothers increasing, many families are finding they simply don"t have the time, money or energy to have more than one child. As only children become common, perhaps the world will realize that the charge made against them is unjust.
1. it can be inferred from the passage that the author"s attitude towards only children is _______.
A. objective B. subjective C. ironic D. Humorous
2. It can be inferred from the passage that only children"s parents should______.
A. do volunteer work to help their only children B. let their only children make all the decisions alone C. set good examples for their only children D. found a support group for their only children
3. Emerson decided to move his elderly mother to a new house because he _______.
A. is the only who cares about her B. doesn"t want to leave her alone C. wants to share the responsibility with her D. is worried about her safety
4. It is quite usual now for a working mother to__________.
A. spend all her time and money on her only child B. be responsible for bringing up her only child C. have and bring up only one child D. devote all her energy to her job
5. The main idea of the passage is that______.
A. only children have to face many challenges B. only children are ruined and irresponsible C. most only children want to share their responsibility with their parents D. most only children have no brothers and sisters