補全短文(第46～50題，每題2分，共10分)$lesson$

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　　Should the U.S. halt human apace 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 years 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.

　　答案：46. E　　47. B　　48. F　　49. C　　50. A

　　我們首先看六個選項，目的是為了能夠抓住一些關聯詞并且能夠了解選項的意思，為后面做題做準備。

　　A 注意instead 代替; 頂替

　　B 宇航員是擴展探索的關鍵。

　　C 注意這里的it，前面一定是有it指代的對象。

　　D Until then...直到那時...,空句前面

　　E 最近的一位美國人離開月球表面，回到地球的事已經是30多年前了。

　　F 送人類進入太空并且使其能回到地面的能力給我們帶來了關于人類本身和我們宇宙的驚奇信息。

　　46. E　由前句我們可知，這是一名老師在講述人類第一次登上月球帶給他和他學生的感動，后面一句是And we haven't ventured outward since then我們從那以后就沒有了對外界的冒險。所以空句應該是E

　　47. B　這段話只有一個句子，其中用的最多的名詞就是human，例如human visits，living facility for humans，human expeditions原因就是選項B，因為宇航員是擴展探索的關鍵。原文中的human指的就是宇航員。

　　48. F　空句后面是Robots are useful, but humans can do things that robots can't.雖然機器人很有用，但是人類能做機器人不能做的事。很明顯這是在強調人類的能力，所以選項F符合。

　　49. C 這段話是講人類太空飛行中遇到的漂移解決方案。既不是技術上的，也不是財政上的，而是缺乏準備開始為宇航事業獻身精神。

　　50. A 從哥倫比亞事故中吸取的教訓不是我們不屬于太空，而是我們應該展開太空探索以此來表達我們對那些犧牲了的宇航員的夢想的尊敬。