题目内容
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The spacecraft will send back______ on surface winds and temperatures.
A．many new information
B．some new information
C．a new information
D．a few new information
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A．carrying passengers to planets
B．acting as stop- over points
C．refueling spacecraft
D．providing supply of air, food and water
Orbits decay due to ______.
A．the acceleration of the spacecraft
B．the crash with small amounts of air molecules
C．the invention and application of solar sails
D．the existence of air molecules
Which of the following is not Russian achievement in space exploration？
A．The first astronaut who was sent to space.
B．The first landing of manned spacecraft on the moon.
C．Launching of the first man-made satellite.
D．Rockets that can be used to save astronauts in space stations.
When space travelers grasp the wall of their spacecraft and jerk their bodies back and forth, they say it feels as though they are stationary and the spacecraft is moving. The reason is based in our reliance on gravity to perceive our surroundings.
The continuous and universal nature of gravity removes it from our daily notice, but our bodies never forget. Whether we realize it or not, we have evolved a large number of silent, automatic reactions to cope with the constant stress of living in a downward-pulling world. Only when we decrease or increase the effective force of gravity on our bodies do our minds perceive it.
Our senses provide accurate information about the location of our center of mass and the relative positions of our body parts. Our brains integrate signals from our eyes and ears with other information from the organs in our inner ear, from our muscles and joints, and from our senses of touch and pressure.
The apparatus of the inner ear is partitioned into two distinct components: circular, fluid-filled tubes that sense the angle of the head, and two bags filled with calcium crystals embedded in a thick fluid, which respond to linear movement. The movement of the calcium crystals sends a signal to the brain to tell us the direction of gravity. This is not the only cue the brain receives. Nerves in the muscles, joints, and skin—particularly the slain on the bottom of the feet—respond to the weight of limb segments and other body parts.
Removing gravity transforms these signals. The inner ear no longer perceives a downward tendency when the head moves. The limbs no longer have weight, so muscles are no longer required to contract and relax in the usual way to maintain posture and bring about movement. Nerves that respond to touch and pressure in the feet and ankles no longer signal the direction of down. These and other changes contribute to orientation illusions, such as a feeling that the body or the spacecraft spontaneously changes direction. In 1961 a Russian astronaut reported vivid sensations of being upside down; one space shuttle specialist in astronomy said, "When the main engines cut off, I immediately felt as though we had inverted 180 degrees." Such illusions can recur even after some time in space.
From the first two paragraphs we learn that weightlessness is caused by ______.
A．many factors
B．the dominant and single movement
C．jerking the bodies back and forth
D．losing the dependence of gravity
The journey to the moon has been the first step towards future explorations in space. The distance between the moon and the Earth is very short indeed when compared with the distances between Earth and the other planets. Mars, the nearest planet to Earth is of miles away ! Traveling to the planets or travels between planets will be man’ s next aim. Such travels will be more difficult than the trip to the moon and certainly more exciting.
Recently, two American unmanned spacecraft, Vikings 1 and 2, landed on Mars in an attempt to discover whether that planet had any life on it. So far the presence of life on Mars has neither been proved nor ruled out. Russian space-probes have discovered that the surface of Venus is so hot that it is almost certain that there is no life there. Also the atmosphere of Venus is extremely, dense and the pressure is nearly a hundred times greater than the pressure of the Earth’s atmosphere.
Scientists believe that in the future, space stations can be built in space. These stations can act as stop-over points in space. Spacecraft can refuel at these stations and get their supply of air, food and water.
Spaceships of the future will be bigger and faster. They will be able to carry passengers for trips to the moon or planets.
Man may in the future find planets which have the same conditions as those we have on Earth, and make them his home. However such a possibility is still in the distant future. At the same time, Man should realize that the Earth will be his only home for a long time and begin to value and care for it.
Which of the following statements is true？
A．Recently, two American astronauts have landed on Mars.
B．The surface of Mars is very hot.
C．The journey to the moon started the future exploration in space.
D．There is life in Venus.
Russia certainly has great prowess in space. In its former guise as the centre of power in the Soviet Union it launched the first man-made satellite in 1957. In a spectacular follow up, Yuri Gagarin became the first person in space in 1961. Another triumph came in 1968 when the Russians sent a spaceship to orbit the moon with turtles aboard, returning it and its living cargo safely to Earth. An unmanned Russian spacecraft also landed on the moon ahead of the first manned landing by the Americans. Even after Neil Armstrong took his one small step, Russia has proved its superiority in keeping people in space stations orbiting the Earth. The Russian Soyuz rocket is a mainstay of satellite launches and would be used to rescue astronauts should any accident befall the International Space Station.
Head of the spacecraft manufacturer that helped achieve these Russian successes, this week boasted that his rockets could be used to industrialise the moon. So why were his remarks greeted with such scepticism？
One reason for the cynicism is that the idea is absurd. A United Nations treaty passed in 1967 bans potentially harmful interference with the Earth's original satellite and requires international consultation before proceeding with any activity that could disrupt the peaceful exploration of space, including the moon. A second problem is that landing on the moon has proved beyond the budget of any state other than America and of any private company to date.
In fact one of the best hopes for investment comes from space tourism. On Saturday April 7th, the fifth such holidaymaker entered space aboard a Russian Soyuz rocket. Charles Simonyi, an American software developer, paid $25m for his ten-day stay at the International Space Station. The next holiday destination is the moon. The tour operator that organised the first five packages is offering two tickets to orbit the moon for $100m each. Launch would be aboard a Soyuz spacecraft. But the Soyuz system was designed in the 1960s and has been on the verge of retirement for many years. Unfortunately the Russian authorities have postponed indefinitely the development of a successor. Thus the claim of the industrialisation of the moon is unlikely to succeed.
The Underlined word" lunacy" (Line 4, Paragraph 1) most probably means ______.
A．an effort to explore the universe.
B．a kind of insane state connected with the moon.
C．the ability to transfer harmful industries onto the moon.
D．the power to orbit around the moon.
Yet there are vital differences between Lewis and Clark’s expedition and a Mars mission. First, Lewis and Clark were headed to a place amenable to life; hundreds of thousands of people were already living there. Second, Lewis and Clark were certain to discover places and things of immediate value to the new nation. Third, the Lewis and Clark venture cost next to nothing by today’s standards. In 1989 NASA estimated that a people-to-Mars program would cost $ 400 billion, which inflates to $ 600 billion today. But the fact that a destination is tantalizing does not mean the journey makes sense, even considering the human calling to explore. And Mars as a destination for people makes absolutely no sense with current technology.
Present systems for getting from Earth’s surface to low-Earth orbit are so fantastically expensive that merely launching the 1,000 tons or so of spacecraft and equipment a Mars mission would require could be accomplished only by cutting health-care benefits, education spending or other important programs or by raising taxes. Absent some remarkable discovery, astronauts, geologists and biologists once on Mars could do little more than analyze rocks and feel awestruck beholding the sky of another world.
It is interesting to note that when President Bush unveiled his proposal, he listed these recent major achievements of space exploration: pictures of the rings of Saturn and the outer planets, evidence of water on Mars and the moon of Jupiter, discovery of more than 100 planets outside our solar system and study of the soil of Mars. All these accomplishments came from automated probes or automated space telescopes. Bush’s proposal, which calls for “reprogramming” some of NASA’s present budget into the Mars effort, might actually lead to a reduction in such unmanned science, the one aspect of space exploration that’s working really well.
Rather than spend hundreds of billions of dollars to hurl tons toward Mars using current technology, why not take a decade or two decades, or however much time is required researching new launch systems and advanced propulsion？ If new launch systems could put weight into orbit affordably, and if advanced propulsion could speed up that long, slow transit to Mars, then the dreams of stepping onto the Red Planet might become reality. Mars will still be there when the technology is ready.
The drive to explore is part of what makes us human, and exploration of the past has led to unexpected glories. Dreams must be tempered by realism, however. For the moment, going to Mars is hopelessly unrealistic.
George Bush’s comparison of Lewis and Clark’s expedition and a Mars mission is mentioned
A．to show that both are of the same and immediate value.
B．to encourage the American people to venture into space.
C．to display the same spirit of discovery in space exploration.
D．to stress that a Mars mission lacks sound and solid basis.
The most spectacular pictures so far have been provided by Mars Express, the European Space Agency's contribution to the fleet. On January 28th this reached its final working orbit (which takes it over both poles, and thus allows it to see the whole of Mars over the course of a few days as the planet revolves beneath it). It has, however, been sending back data since shortly after it arrived, and a few days ago its controllers released a series of beautiful photographs, including a stereo image of Valles Marineris, a huge canyon that may have been formed by flowing water.
The most scientifically significant result, though, has come from Opportunity, America's second Mars rover. One of Opportunity's cameras has photographed evidence of stratification in nearby rocks. Such stratification indicates that the rocks concerned are sedimentary. The layers could be repeated wind-blown deposits, or consist of ash from successive volcanic eruptions. But the terrestrial rocks they most resemble are ones that have formed under water.
The reason everyone is getting so excited is because there is a widespread assumption that any form. of life which might dwell on Mars would need liquid water to live—or, even if it could now subsist by extracting moisture from ice, would have needed liquid water to evolve to that stage. Mars has seen more probes launched towards it than all of the other planets put together precisely because of this hope that it might harbour life. So there is a lot riding on the answer—not least the funding of future missions.
Besides its scientific significance, the success of Opportunity has also helped to distract attention from the sudden refusal of Spirit, the first American rover to arrive on Mars, to talk to its controllers. This craft had tentatively, but successfully, nosed its way off its landing platform, and was about to drill its way into a nearby rock prior to doing a spot of chemical analysis, when it went silent.
However, the engineers at NASA, America's space agency, are nothing if not resourceful, and they have a good record of carrying out running repairs on spacecraft that are millions of kilometres away. In the case of Spirit, they think that one of the craft's memory chips has got cluttered up with files created on the journey to Mars. That caused another chip, which manages the first, to throw a wobbly and to keep rebooting the computer. They are currently testing this idea by loading a diagnostic program on to the computer. In addition, as a precaution, they have deleted excess files from the equivalent memory chip on Opportunity.
Spirit's spirits may thus revive. As to the failures, the Japanese abandoned their fly-by craft Nozomi in December, and the British team in charge of Beagle 2, which is presumed to have landed on December 25th but from which no signal has been received, also seems to have called it quits. Still, a 40460% success rate (depending on whether Spirit is brought back into commission) is not bad by the historical standards of missions to Mars. Now, the real science begins.
Mars Express is mentioned because______.
A．it has been sending data back to the Earth
B．it illustrates Europe's contribution to the project
C．it is the first craft to have ever landed on the Mars
D．it can help researchers see the whole of the Mars
