A.Computer helps find the best program for mixing plants. |
B.Computer helps produce more crops. |
C.Computer helps protect against insects and diseases. |
D.Computer helps grow different plants. |
A.the kinds of crops to be planted together |
B.the way for different crops to be mixed |
C.both A and B |
D.either A or B |
A.whether we should grow cotton and tomato together |
B.how we should plant cotton and tomato together |
C.what will happen if we grow potato, instead of tomato, together with cotton |
D.how we can grow rice in the tomato field |
A.man power | B.seeds | C.time | D.land |
A.Computers can tell farmers how many plants can grow together. |
B.With the help of computers farmers don't have to do a lot of work. |
C.With the help of computers farmers can get better results. |
D.The change of one plant may cause a change in production. |
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A.the problems we are facing today about environment and the ways to solve them |
B.the unlimited natural resources in the world |
C.our rivers are being polluted by waste from factories |
D.the ways early man protected the environment |
A.If we eat more vegetables, more food can be saved. |
B.In the past, there was no need for people to think about environmental protection. |
C.If we keep on cutting trees, forests will disappear. |
D.We shouldn’t take more and more fish out of the sea, or there will soon be no fish left. |
A.Man is cleverer than any other animal. |
B.Man will destroy himself if he doesn’t solve the problem. |
C.Modern fishing methods are helpful in our fishing industry. |
D.We should make more laws in order to survive. |
A.will never be used up | B.a(chǎn)re being polluted |
C.a(chǎn)re as plentiful as in the past | D.a(chǎn)re being used up very quickly |
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A.The treatment of wastewater is a huge energy cost. |
B.Wastewater is being treated differently over the world. |
C.Waste treatment plants have found a new way to power themselves. |
D.Microbial fuel cells will produce more electricity from wastewater. |
A.It can produce 100 times more electricity than any approach used today. |
B.Through it more electricity can be created and water can be cleaned better. |
C.It has already changed the way that wastewater is treated all over the world |
D.It has opened the door to put microbial fuel cells to productive use. |
A.Because it is co-friendly and treats wastewater more effectively. |
B.Because it can make full use of anaerobic digestion producing methane. |
C.Because it may produce less methane than the alternative approach. |
D.Because it can produce 10 times the energy than the alternative approach. |
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C. Are you more sensitive than other students? |
D. Are you interested in your lessons? |
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C.Puzzled. | D.Uncertain. |
A.People’s love for nature. |
B.Great changes in people’s way of life. |
C.People’s desire to change the world. |
D.The wonderful imagination in inventing things. |
A.The microwave oven was first used by working mothers. |
B.People cook less because of modern kitchen equipment. |
C.Technology has little effect on the changes of family behavior. |
D.People need less skill to do housework due to advanced technology. |
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A.they suffer the effects of their diet and lifestyle |
B.the organs stop to perform appropriately |
C.their cells continue to renew themselves |
D.they develop arthritis and Alzheimer’s |
A.a(chǎn)lligators are in danger in the wild because of the threat from man, pollution and other animals |
B.it is widely accepted that humans have a fixed lifespan |
C.there exists an age gene which may control ageing |
D.the age gene damages the body |
A.live for a period of time without a fixed end |
B.live without a clear aim |
C.live in an uncertain way |
D.live without being fully grown |
A.by 2050 we might have most of our worn-out organs replaced with new ones commercially |
B.never can the ageing process be avoided |
C.livers and kidneys are sure to be grown in laboratories by the year 2020 |
D.lizards and alligators grow new organs inside their body to replace worn-out ones |
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B.Anti-oxidants are likely to play an important part in keeping people young. |
C.How our biological clock works? |
D.Eternal(永恒的) youth: new developments in anti-ageing research. |
A.a(chǎn) future where we are born, we grow to maturity, but we never grow old and die is on its way |
B.he is uncertain whether we can live forever |
C.it remains to be seen whether immortality is a blessing or a curse |
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C.Eco City Farms helps the working-class live better. |
D.Eco City Farms are gaining popularity. |
A.Enthusiastic. | B.Disappointed. |
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A.shopping centers |
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C.fast-food restaurants |
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A.to become active during sleep |
B.to tell the difference between smell |
C.to learn new words and scientific facts |
D.to make sound-smell connections |
A.They took a deep breath. | B.They had a wonderful dream. |
C.They woke up at once. | D.They took a short breath. |
A.learned how to play to musical tones |
B.forgot what happened during their sleep |
C.continued with the sound-smell connection |
D.changed their reaction when hearing. |
A.special smells and sounds can improve our memory. |
B.our brain can actually learn something new during the sleep. |
C.the volunteers will always hear similar sounds in the street. |
D.our brain can tell the difference between smells during the sleep. |
A.A short sleep can improve our memory and sharpen our thinking. |
B.Arzi and her coworkers didn’t try to teach the sleeping volunteer some simple information. |
C.When the volunteer smelt something terrible, they didn’t wake up. |
D.After four repetitions, volunteers made a connection between the musical notes and their pared smells. |
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A.research is declining in importance | B.teaching now ranks above research |
C.teaching is a sure way to gain position | D.research still ranks above teaching |
A.began to change all of a sudden |
B.was already threatened by research work |
C.was the central part of higher education |
D.began to be neglected in most universities |
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C.Teaching and research in universities | D.Undergraduate teaching rediscovered |
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