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    16£®Why should mankind explore space£¿Why should money£¬time and effort be spent exploring and researching something with so few apparent benefits£¿Why should resources be spent on space rather than on conditions and people on Earth£¿These are questions that£¬understandably£¬are very often asked£®
    Perhaps the best answer lies in our genetic makeup£¨»ùÒò¹¹³É£© as human beings£®What drove our ancestors to move from the trees into the plains£¬and on into all possible areas and environments£¿The wider the spread of'a species£¬the better its chance of survival£®Perhaps the best reason for exploring space is this genetic tendency to expand wherever possible£®
    Nearly every successful civilization has explored£¬because by doing so£¬any dangers in surrounding areas can be identified and prepared for£®Without knowledge£¬we may be completely destroyed by the danger£®With knowledge£¬we can lessen its effects£®
        Exploration also allows minerals and other potential£¨Ç±Ôڵģ©resources to be found£®Even if we have no immediate need of them£¬they will perhaps be useful later£®Resources may be more than physical possessions£®Knowledge or techniques have been acquired through exploration£®The techniques may have medical applications which can improve the length or quality of our lives£®We have already benefited from other spin-offs including improvements in earthquake prediction£¬in satellites for weather forecasting and in communications systems£®Even non-stick pans  and mirrored sunglasses  are by-products£¨¸±²úÆ·£©of technological developments  in the  space  industry!
         While many resources are spent on what seems a small return£¬the exploration of space allows creative£¬brave and intelligent members of our species to focus on what may serve to save us£®While space may hold many wonders and explanations of how the universe was formed or how it works£¬it also holds dangers£®The danger exists£¬but knowledge can help human beings to survive£®Without the ability to reach out across space£¬the chance to save ourselves might not exist£®
         While Earth is the only planet known to support life£¬surely the adaptive ability of humans would allow us to live on other planets£®It is true that the lifestyle would be different£¬but human life and cultures have adapted in the past and surely could in the future£®
    51£®Why does the author mention the questions in Paragraph l£¿C
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    B£®To compare different ideas£®
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    D£®To describe the conditions on Earth£®
    52£®What is the reason for exploring space based on Paragraph 2£¿A
    A£®Humans are nature-born to do so£®
    B£®Humans have the tendency to fight£®
    C£®Humans may find new sources of food£®
    D£®Humans don't like to stay in the same place£®
    53£®The underlined word"spin-offs"in Paragraph 4 probably refers toC
    A£®survival chances                        B£®potential resources
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    54£®What makes it possible for humans to live on other planets£¿C
    A£®Our genetic makeup£®
    B£®Resources on the earth£®
    C£®The adaptive ability of humans£®
    D£®By-products in space exploration£®
    55£®Which of the statements can best sum up the passage£¿D
    A£®Space exploration has created many wonders£®
    B£®Space exploration provides the best value for money£®
    C£®Space exploration can benefit science and technology£®
    D£®Space exploration may help us avoid potential problems on Earth£®

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