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Should the U.S. halt human space flight？ The Columbia accident has revived the debate

Should the U.S. halt human space flight？

The Columbia accident has revived the debate on whether the rewards of human space exploration are worth the risks.

No. I was a teacher when men first landed on the moon in 1969, and I remember how it moved my students and this country.___________(46) And we haven't ventured outward since then. That's 30 years too long! America's human space-flight program is adrift, with no clear vision or goals beyond the completion of the International Space Station.

I want NASA to establish a phased series of goals over the next 20 years, including human visits to asteroids that cross the Earth's orbit, establishing a research and living facility for humans on the moon, and human expeditions to the surface of Mars and its moons.___________(47)

An astronaut is today's Christopher Columbus, who sailed into the unknown and discovered the Americas. The knowledge we gain from having actual people exploring can never be replaced by robots.___________ (48) Robots are useful, but humans can do things that robots can't.

The real obstacle we face in overcoming the drift in the nation's human space-flight program is not technological and it's not financial.___________ (49)The lesson from the Columbia accident is not that humans don't belong in space.___________ (50)

A．Instead, we should honor the memory of the lost astronauts by pushing our exploration of space future.

B．Astronauts are key to this expanded exploration.

C．It's the lack of commitment to get started.

D．Until then, we should stop risking people's lives by sending them into space.

E．It is now more than 30 year since the last American left the surface of the moon and returned to Earth.

F．Our ability to send humans into space and have them return gives us amazing information about ourselves and our universe.

第 46 题请选择（46）处的最佳答案．

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发布时间：2020-10-11

更多“Should the U.S. halt human space flight？ The Columbia accident has revived the debate”相关的问题

第1题

World leaders met recently at United Nations headquarters in New York City to discuss the

environmental issues raised at the Rio Earth Summit in 1992．The heads of state were supposed to decide what further steps should be taken to halt the decline of Earth's life-support systems．In fact，this meeting had much the flavour of the original Earth Summit．To wit：empty promises，hollow rhetoric，bickering between rich and poor，and irrelevant initiatives．Think U.S. Congress in slow motion．

Almost obscured by this torpor is the fact that there has been some remarkable progress over the past five years—real changes in the attitude of ordinary people in the Third World toward family size and a dawning realisation that environmental degradation and their own well-being are intimately，and inversely，linked．Almost none of this，however, has anything to do with what the bureaucrats accomplished in Rio．

Or it didn't accomplish．One item on the agenda at Rio，for example，was a renewed effort to save tropical forests．(A previous UN-sponsored initiative had fallen apart when it became clear that it actually hastened deforestation．)After Rio，a UN working group came up with more than 100 recommendations that have so far gone nowhere．One proposed forestry pact would do little more than immunizing wood-exporting nations against trade sanctions．

An effort to draft an agreement on what to do about the climate changes caused by CO2 and other greenhouse gases has fared even worse．Blocked by the Bush Administration from setting mandatory limits，the UN in 1992 called on nations to voluntarily reduce emissions to 1990 levels．Several years later，it's as if Rio had never happened．A new climate treaty is scheduled to be signed this December in Kyoto，Japan，but governments still cannot agree on these limits．Meanwhile，the U.S. produces 7% more CO2 than it did in 1990，and emissions in the developing world have risen even more sharply．No one would confuse the“Rio process”with progress．

While governments have dithered at a pace that could make drifting continents impatient，people have acted．Birth-rates are dropping faster than expected，not because of Rio but because poor people are deciding on their own to reduce family size．Another positive development has been a growing environmental consciousness among the poor．From slum dwellers in Karachi，Pakistan，to colonists in Rondonia，Brazil，urban poor and rural peasants alike seem to realize that they pay the biggest price for pollution and deforestation．There is cause for hope as well in the growing recognition among business people that it is not in their long-term interest to fight environmental reforms．John Browne，chief executive of British Petroleum，boldly asserted in a major speech in May that the threat of climate change could no longer be ignored．

The writer's general attitude towards the world leaders meeting at the UN is______．

A．supportive

B．impartial

C．critical

D．comedic

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第2题

Alternative sentencing is so widespread in the U.S. that guidelines should be provided by

the federal government.

A．Y

B．N

C．NG

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第3题

Love in England should be similar to that in the U.S. because the two countries share a lo

t in common.

A．Y

B．N

C．NG

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第4题

The idea based on by the American educational system is that ______.A．the results of the e

The idea based on by the American educational system is that ______.

A．the results of the examination systematically prevent the students from going on to a higher level of study

B．the U.S. tries as much to screen people out as it is to keep them in

C．as many people as possible should have as much education as possible

D．the U.S. should have standardized examination

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第5题

The author of the passage would most likely agree that ______.A．the U.S. government's poli

The author of the passage would most likely agree that ______.

A．the U.S. government's policies towards the American Indians were progressive

B．the west should be controlled by the U.S. government

C．numerous abuses were among the results of the railroads' rapid spread

D．the U. S. army could be considered a friend of the American Indian

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第6题

The author suggests that Wall Street shouldA．lobby the legislators to change Dodd-Frank ac

The author suggests that Wall Street should

A．lobby the legislators to change Dodd-Frank act.

B．draft regulatory framework for the banking industry.

C．help the government to perfect the new regulations.

D．create and sell new financial derivatives in the U.S.

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第7题

What does the author mean when he interprets the urge for a sharper focus？A．The U.S. will

What does the author mean when he interprets the urge for a sharper focus？

A．The U.S. will be justified in cutting its financial contribution.

B．More heated arguments will be unavoidable between richer and poorer countries.

C．There should be better service for poorer countries but no cost cutting.

D．The poorer countries will not receive more benefits.

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第8题

Question 6 The table below shows the bushels of wheat and the yards of cloth that the Unit

Question 6

The table below shows the bushels of wheat and the yards of cloth that the United States and Britain can produce with one hour of labor time. Question 6 The table below shows the bushels of wh

(a)Please identify the commodity in which the U.S. and Britain have an absolute advantage or disadvantage？

(b)Indicate the commodity in which the U.S. and Britain have a comparative advantage or disadvantage？

(c)If the two countries are to trade with each other, which goods should they expert？ Why？

(d)Would trade benefit both of them？ Why？

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第9题

As the UN hesitates，the poor take action World leaders met recently at United Nations

As the UN hesitates，the poor take action

World leaders met recently at United Nations headquarters in New York City to diSCUSS the environmental issues raised at the Rio Earth Summit in 1992．The heads of state were supposed to decide what further steps should be taken to halt the decline of Earth’s life-support systems．In fact，this meeting had mach the flavor 0f the original Earth Summit．To wit：empty rhetoric and bickering between rich and poor．Think U．S． Congress in slow motion．

Almost obscured by this torpor is the fact that there has been some remarkable progress over the past five years-11eal changes in the attitude of ordinary people in the Third World toward family size and a dawning realization that environmental degradation and their own well-being are intimately linked．A1most none of this，however，has anything to d0 with what the bureaucrats accomplished in Rio．

Or didn’ t accomplish． One item one the agenda at Rio，for example，was a renewed effort to save tropical forests．（A pervious UN—sponsored initiative had fallen apart when it became clear that it actually hastened deforestation．）After Rio，a UN working group came up with more than 100 recommendations that have s0 far gone nowhere．One proposed forestry pact would do little more than immunize wood-exporting nations against trade sanctions．

An effort to draft an agreement on what to do about the climate changes caused by CO，and other greenhouse gases has flared even worse． Blocked by the Bush Administration from setting mandatory limits，the UN in 1992 called on nations to voluntarily I．educe emissions to 1990 levels．Several years later，it’s as if Rio had never happened．A new climate treaty is scheduled to be signed this December in Kyoto，Japan，but governments still cannot agree on limits meanwhile，the U．S．produces 7％ more CO than it did in 1990，and emissions in the developing world have risen even more sharply．No one would confuse the“Ri0 process ”with progress．

While governments have dithered at a pace that could make drifting continents impatient，people have acted．Birth-rates are dropping faster than expected，not because of Ri0 but poor people are deciding on their own t0 limit family size． Another positive development has been a growing environmental consciousness among the poor． From slum dwellers in Karachi，Pakistan，to colonists in Ron-donia，Brazil，urban poor and rural peasants alike seem to realize that they pay the biggest price for pollution and deforestation．There is cause for hope we well in the growing recognition among business people that it is not in their long-term interests to 6ght environmental reforms． John Browne，chief executive of British Petroleum，boldly asserted in a major speech in May that the threat of climate change could no longer be ignored．

第 41 题 The writer’s general attitude towards the World leaders meeting at the UN is

A．supportive

B．impartial

C．critical

D．optimistic

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第10题

The United States government publishes guidelines for appropriate nutrient intakes. These

are known as the Recommended Dietary Allowances (RDAs) and are updated regularly based on new research in nutrition. RDAs are suggested amounts of calories, protein, and some minerals and vitamins for an adequate diet. For other dietary substances, specific goals must await further research. However, for the U.S. population as a whole, increasing starch and fiber in one's diet and reducing calories (primarily from fats. sugar, and alcohol) is sensible. These suggestions are especially appropriate for people who have other factors for chronic diseases due to family history of obesity, premature heart disease, diabetes, high blood pressure, and high blood cholesterol, or for those who use tobacco.

Snacks can furnish about one-fourth of the calorie requirements among teenagers. Those snacks should also provide much of the day's allowances for protein, minerals, and vitamins. Sandwiches, fruit, and milk make good snacks for active teenagers. Food from the food pyramid may be part of any meal. A grilled cheese sandwich or a bowl of whole-grain cereal is just as nutritious in the morning as it is at noon. In addition, a good breakfast consists of any foods that supply about one-fourth of the necessary nutrients for the day.

The passage directly states that most of the U.S. population should increase their intake of ______.

A．protein

B．fats

C．starch and fiber

D．sandwiches

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