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    53．Which of the following is TRUE? A．Space is dangerous only because of meteors. B．Explorers in space have to avoid the damage from radiation C．We have got effective ways to treat illnesses caused by radiation. D．The atmosphere doesn’t screen off radiation D Have you ever dreamed of visiting a planet in the Milk Way ?While the trip sounds exciting, it would take years and years to reach your destination. So in the future, bedtime for astronauts may be more than a few hours of regular shut-eye. They would have to sleep for years. European researchers are now conducting hibernation experiments. The study may help them understand whether humans could ever sleep through the years it would take for a spaceflight to distant planets. “If there was an effective technology, it could make deep-space travel a reality, said Mark Ayre of the European Space Agency last month. What seems like science fiction is not completely unlikely. Researchers have been able to use chemicals to put living cells into a sleep-like state. They have now moved on to small, non-hibernating mammals like rats. A major challenge is the fact that cells can be very simple systems, whereas body organs are far more complex. “It’s like moving from a simple Apple computer to a supercomputer, said Marco Biggiogera, a hibernation researcher at Italy’s University of Pavia. Just like bears and frogs, the hibernation of human beings would cause a person’s metabolism to lower so they would need less energy. Medical research, however, is just half of a spaceflight hibernation system. There is the challenge of designing a suitable protective shelter. Such a shelter would provide the proper environment for hibernation, such as the proper temperature It would also have to monitor life functions and serve the physiological needs of the hibernator. According to Ayre, the six-person human Outer Planets Exploration Mission to jupiter’s moon Callisto, could be an opportunity to use human hibernation. The mission aims to send six humans on a five-year flight to Callisto, where they will spend 30 days, in 2045. 【查看更多】

     

    题目列表(包括答案和解析)

    Space is a dangerous place, not only because of meteors(流星), but also because of rays from the sun and other stars. The atmosphere again acts as our protective blanket on the earth. Light gets through, and this is necessary for plants to make the food which we eat. Heat, too, makes our environment suitable to live. Various kinds of rays come through the air from outer space, but enormous quantities of radiation from the sun are screened off. As soon as men leave the atmosphere they are exposed to this radiation but their spacesuits or the walls of their spacecraft, if they are inside, do prevent a lot of radiation damage.

    Radiation is the greatest known danger to explorers in space. The unit of radiation is called “rem”. Scientists have reason to think that a man can put up with far more radiation than 0.1 rem without being damaged; the figure of 60 rems has been agreed on. The trouble is that it is extremely difficult to be sure about radiation damage a person may feel perfectly well, but the cells of his or her sex organs may be damaged, and this will not be discovered until the birth of deformed(畸形的)children or even grandchildren. Missions of the Apollo flights have had to cross belts of high radiation and, during the outward and return journeys, the Apollo crew accumulated a large amount of rems. So far, no dangerous amounts of radiation have been reported, but the Apollo missions have been quite short. We simply do not know yet how men are going to get on when they spend weeks and months outside the protection of the atmosphere, working in a space laboratory. Drugs might help to decrease the damage done by radiation, but no really effective ones have been found so far.

    49．According to the first paragraph, the atmosphere is necessary to man because of the following reason EXCEPT________

    A．protecting him against the harmful rays from space

    B．providing sufficient light for plant growth

    C．suppling the heat necessary for human survival

    D．screening off the falling meteors

    50．We learn from the passage that ________

    A．exposure to even tiny amounts of radiation is fatal

    B．the effect of exposure to radiation is slow in coming

    C．radiation is avoidable in space exploration

    D．astronauts in spacesuits needn’t worry about radiation damage

    51．The harm radiation that has been done to the Apollo crew members ________

    A．is insignificant   B．is enormous   C．seems overestimated  D．remains unknown

    52．It can be inferred from the passage that________

    A．the Apollo mission was very successful

    B．the protection from space radiation is no easy job

    C．astronauts may possibly have deformed children or grandchildren

    D．radiation is not a threat to well-protected space explorers

    53．Which of the following is TRUE?

    A．Space is dangerous only because of meteors.

    B．Explorers in space have to avoid the damage from radiation

    C．We have got effective ways to treat illnesses caused by radiation.

    D．The atmosphere doesn’t screen off radiation

    查看答案和解析>>

    Space is a dangerous place, not only because of meteors(流星), but also because of rays from the sun and other stars. The atmosphere again acts as our protective blanket on the earth. Light gets through, and this is necessary for plants to make the food which we eat. Heat, too, makes our environment suitable to live. Various kinds of rays come through the air from outer space, but enormous quantities of radiation from the sun are screened off. As soon as men leave the atmosphere they are exposed to this radiation but their spacesuits or the walls of their spacecraft, if they are inside, do prevent a lot of radiation damage.

    Radiation is the greatest known danger to explorers in space. The unit of radiation is called “rem”. Scientists have reason to think that a man can put up with far more radiation than 0.1 rem without being damaged; the figure of 60 rems has been agreed on. The trouble is that it is extremely difficult to be sure about radiation damage a person may feel perfectly well, but the cells of his or her sex organs may be damaged, and this will not be discovered until the birth of deformed(畸形的)children or even grandchildren. Missions of the Apollo flights have had to cross belts of high radiation and, during the outward and return journeys, the Apollo crew accumulated a large amount of rems. So far, no dangerous amounts of radiation have been reported, but the Apollo missions have been quite short. We simply do not know yet how men are going to get on when they spend weeks and months outside the protection of the atmosphere, working in a space laboratory. Drugs might help to decrease the damage done by radiation, but no really effective ones have been found so far.

     

    49．According to the first paragraph, the atmosphere is necessary to man because of the following reason EXCEPT________

    A．protecting him against the harmful rays from space

    B．providing sufficient light for plant growth

    C．suppling the heat necessary for human survival

    D．screening off the falling meteors

    50．We learn from the passage that ________

    A．exposure to even tiny amounts of radiation is fatal

    B．the effect of exposure to radiation is slow in coming

    C．radiation is avoidable in space exploration

    D．astronauts in spacesuits needn’t worry about radiation damage

    51．The harm radiation that has been done to the Apollo crew members ________

    A．is insignificant   B．is enormous   C．seems overestimated  D．remains unknown

    52．It can be inferred from the passage that________

    A．the Apollo mission was very successful

    B．the protection from space radiation is no easy job

    C．astronauts may possibly have deformed children or grandchildren

    D．radiation is not a threat to well-protected space explorers

    53．Which of the following is TRUE?

    A．Space is dangerous only because of meteors.

    B．Explorers in space have to avoid the damage from radiation

    C．We have got effective ways to treat illnesses caused by radiation.

    D．The atmosphere doesn’t screen off radiation

    查看答案和解析>>

    阅读理解

    　　Space is a dangerous place, not only because of meteors(流星), but also because of rays from the sun and other stars．The atmosphere again acts as our protective blanket on the earth．Light gets through, and this is necessary for plants to make the food which we eat．Heat, too, makes our environment suitable to live．Various kinds of rays come through the air from outer space, but enormous quantities of radiation from the sun are screened off．As soon as men leave the atmosphere they are exposed to this radiation but their spacesuits or the walls of their spacecraft, if they are inside, do prevent a lot of radiation damage．

    　　Radiation is the greatest known danger to explorers in space．The unit of radiation is called “rem”．Scientists have reason to think that a man can put up with far more radiation than 0.1 rem

    　　without being damaged; the figure of 60 rems has been agreed on．The trouble is that it is extremely difficult to be sure about radiation damage a person may feel perfectly well, but the cells of his or her sex organs may be damaged, and this will not be discovered until the birth of deformed(畸形的)children or even grandchildren．Missions of the Apollo flights have had to cross belts of high radiation and, during the outward and return journeys, the Apollo crew accumulated a large amount of rems．So far, no dangerous amounts of radiation have been reported, but the Apollo missions have been quite short．We simply do not know yet how men are going to get on when they spend weeks and months outside the protection of the atmosphere, working in a space laboratory．Drugs might help to decrease the damage done by radiation, but no really effective ones have been found so far．

    (1)

    According to the first paragraph, the atmosphere is necessary to man because of the following reason EXCEPT________

    [　　]

    A．

    protecting him against the harmful rays from space

    B．

    providing sufficient light for plant growth

    C．

    suppling the heat necessary for human survival

    D．

    screening off the falling meteors

    (2)

    We learn from the passage that ________

    [　　]

    A．

    exposure to even tiny amounts of radiation is fatal

    B．

    the effect of exposure to radiation is slow in coming

    C．

    radiation is avoidable in space exploration

    D．

    astronauts in spacesuits needn’t worry about radiation damage

    (3)

    The harm radiation that has been done to the Apollo crew members ________

    [　　]

    A．

    is insignificant

    B．

    is enormous

    C．

    seems overestimated

    D．

    remains unknown

    (4)

    It can be inferred from the passage that________

    [　　]

    A．

    the Apollo mission was very successful

    B．

    the protection from space radiation is no easy job

    C．

    astronauts may possibly have deformed children or grandchildren

    D．

    radiation is not a threat to well-protected space explorers

    (5)

    Which of the following is TRUE?

    [　　]

    A．

    Space is dangerous only because of meteors．

    B．

    Explorers in space have to avoid the damage from radiation

    C．

    We have got effective ways to treat illnesses caused by radiation．

    D．

    The atmosphere doesn’t screen off radiation

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