题目内容
（请给出正确答案）
Such electron tubes ______ in a radio set are also found in a TV set.
A．that we use
B．as we use
C．as we use them
D．that we use them
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更多“Such electron tubes ______ in …”相关的问题
A.扫描电子显微镜 Scanning Electron Microscope
B.扫描隧道显微镜 Scanning Electron Microscope
C.扫描电子显微镜 Searching Electron Microscope
D.扫描隧道显微镜 Searching Electron Microscope
According to this passage ,the new generic revolution involves ______.
A．experiments on plants in the fields
B．developing strains of hybrid corn
C．breeding plants in test tubes
D．rearranging plant genes in laboratories
The clock had stopped because Winthrop had put some long glass tubes he was using for an experiment into the box for safekeeping. The quake had knocked the tubes over and blocked the pendulum. Winthrop, therefore, had the exact time that the earthquake had hit Boston. He looked at the key on the floor. The quake had thrown it forward in the direction of the quake's motion by a shock coming from the northwest, perhaps in Canada.
This passage suggests that ______.
A．John Winthrop had difficulty in sleeping
B．earthquakes are common in Boston
C．Boston was a center for clock-making
D．John Winthrop was a scientist
Food for space has to be packed in special ways. Some of it goes into tubes that a man can squeeze into his mouth. Bite-sized cookies are packed in plastic.
There is a good reason for covering each bite. The plastic keeps pieces of food from travelling in the spaceship. On the earth very small pieces of food would simply fall to the floor. But gravity doesn' t pull them to the floor when they are out of the plastic in a spaceship. (78) They move here and there and can get into a man' s eyes or into the spaceship' s instruments. If any of the instruments is blocked, the astronauts may have trouble getting safely home.
As astronauts travel on longer space trips, he must take time to sleep. An astronaut can fit himself to his seat with a kind of seat belt. Or, if he wants to, he can sleep in a sleeping bag which is fixed in place under his seat. But be careful he must put his hands under the belt when he goes to sleep. This is because he is really afraid that he might touch one of controls that isn' t supposed to be touched until later.
Why would astronauts cover each bite of food in space？
A．Because small pieces of food would fall down to the floor.
B．Because weightless pieces of food might make trouble when they travel around.
C．Because they haven' t enough food for longer trips.
D．Because astronauts don' t want to waste food.
The new concepts grew out of the bioengineering of bacteria for the production of such things as human hormones and vaccines for viral diseases. Plant cells, however, are far more complex than bacteria, and it will probably take many years for today's encouraging laboratory results to have a major impact on the farm. In fact the payoff may not come until the next century.
But although bio-technologists are still in the earliest phases of this new field of science, they are already actively exploring ways to redesign plants so they will use sunlight mere efficiently, resist viruses and other pests, grow in hot or dry areas, in saline soils or in the presence of pesticides, and perhaps even make their own fertilizer out of nitrogen in the air. In addition, scientists have had early success in making wholly new plants that are unavailable by conventional plant breeding-a potato-tomato combination, for example.
The new technology holds the promise of virtually limitless horizons in food production. Only imagination sets the limits: frost-resistant wheat, tropical potatoes, saltwater rice, a plant producing a combination of a pea and a carrot-all may be with us one day.
Vaccines for viral diseases are often produced from ______.
A．plant cells
B．human hormones
C．crop plants
D．bacteria
In 06 of population density, London is one of the 07 crowded major cities in the world — four times fewer people per square kilometer than Paris, for example, six times fewer than New York and eight times fewer than Cairo. But the fact remains that the city's population is 08 at a rapid rate, and horizontal expansion into the surrounding areas is 09 up increasingly important agricultural land, as well as worsening all the transport problems that come with urban 10 .
Popular Architecture would propose a radically 11 solution. The proposal is to go upwards, with vertical towers of considerable size, each representing an entire new town by the time it's 12 . Each tower would be 1500 meters high. 13 mere accommodation, each tower would function as an entire town unit, with its own schools, hospitals, parks and gardens, sports facilities, business areas and community spaces. The population density of such a tower could help 14 the individual energy requirements of each inhabitant, reducing the ecological impact of the population as a whole.
The village towers are considered as hollow tubes, with large holes to allow 15 and air through the entire construction. Occasional floor discs spread 16 the height of the building will give inhabitants large central areas in the middle of the tube to use as 17 spaces.
While the building itself is 18 ever to be seriously considered for construction -- imagine the number of elevators it would need, let 19 the safety implications of open areas at such heights and with such wind exposure — the concept can serve as a conversation-starter for urban planners looking to 20 the challenges of the current and coming centuries.
(1)A.crownB.crowdedC.crowdD.crow
(2)A.anywhereB.somewhereC.anyhowD.somehow
(3)A.currentB.currencyC.currenceD.currently
(4)A.thinkingB.thoughC.thinkD.thought
(5)A.ageB.placeC.spaceD.time
(6)A.termsB.turnC.termD.turns
(7)A.lessB.a littleC.leastD.little
(8)A.growB.growingC.grownD.grew
(9)A.eatingB.eatC.ateD.eaten
(10)A.grewB.grownC.growD.growth
(11)A.indifferenceB.indifferentC.differenceD.different
(12)A.completedB.competeC.completeD.competed
(13)A.BeforeB.BetweenC.BehindD.Beyond
(14)A.lowestB.lowC.levelD.lower
(15)A.heavyB.heavierC.lightD.lighter
(16)A.thoughB.throughoutC.throughD.thought
(17)A.togetherB.gatheredC.gatheringD.gather
(18)A.likelyB.unlikelyC.likedD.like
(19)A.loneB.longC.aloneD.lonely
(20)A.facedB.faceC.facingD.faces
A.the overtreatment for dying patients
B.the different attitude of doctor and patients toward death
C.the disproportionately high medicare expenditure in America
D.the unequal and non．transparent doctor—patient relationship
