Someday, you might be able to live on the moon.

  In 2020, NASA plans to begin building a base on the moon.  The project should be finished by 2024. If you’re 10 years old today, ________1________. So, if you train to be an astronaut(宇航员), you could be one of the first to visit the lunar outpost(月球基地).

  Neil Armstrong was the first person to walk on the moon in 1969.  At the time, he called it “one small step for man, ______2______ .”  Space exploration(探索) has continued, but no one has set foot on the moon since 1972.

  For the new project, NASA talked with more than 1,000 scientists and engineers to come up with a plan.  The agency decided to build a single base instead of developing several landing sites.

  At first, astronauts would spend a week at a time on the moon.  ____3____ .  Once there, astronauts would drive around in a rover(月球车) with a cabin(机舱) filled with pressurized air so that they could breathe without wearing spacesuits all the time.

  NASA hasn’t yet decided where on the moon to put the base, and the agency may not make a final decision until 2013.  ____4____ . 

  In the meantime, the space agency is eyeing an area near the moon’s south pole(极点) as a good place to settle.  The area gets sunlight 75 to 80 percent of the time, _____5_____ . Nearby is a dark area that might contain water ice and other resources that could fuel operations(加燃料).

  The moon base could finally become a training site and launching(发射) base for future missions(任务) to Mars.

   A. Finally, stays would last for 6 months, maybe longer.

   B. you’ll be 27years old then.

   C. so the base could run on solar power (太阳能).

   D. one giant leap for mankind.

   E. This decision will depend on data (数据) collected by several robotic scout missions(侦察任务).

1._________ 2.__________ 3.__________ 4.__________ 5.__________

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