In big cities of China, students often bikes, buses or walk to school. [ ]A. on; by B. ride; takeC. ride; on 题目和参考答案——青夏教育精英家教网—

     Once very surprising, now very important, women astronauts (宇航员) explain what's so cool about
zero-g, and what 50 years exploration (探索) has taught the world.
     Peggy Whitson
     Age: 48
    Astronaut since: 1996
   Space time: Two six-month tours on the Intemational Space Station, in 2002 and 2007-2008.
    "Mind is a lot more important than body. So is your ability to think in 3-D and imagine how to move things
in a different way than on earth. The second time I went to the station, it felt like coming home. I got
comfortable much more quickly. Everything is lifted while you're up there, so you look younger. Being back
on earth is not pleas ant at first. Moving around is difficult, like playing basketball. But I had my physical
training for about a month after my retum."
     Sunita Williams
     Age: 43
     Astronaut since: 1998
     Space time: Six months on the space station in 2006-2007, including more than 29 hours of space walks.
    "I learned after about a week how to fly beautifully without going too fast or shaking around. I had a hard
time remembering how to walk, I prefer flying! When you have that idea of being far away anti looking back
at the planet, you don't see any cit- ies or countries. You see a very quiet place. Just as Gandhit-the Father of
the Na- tion in India, once explained the feeling of oneness in all of us. Seeing our planet from space, you
understand that."
     Barbara Morgan
     Age: 56
    Astronaut since: 1985
     Space time: One shuttle mission in 2007
     "No matter how I was situated (处于…位置) the first day, it seemed that my body was upside down
(颠倒着). That might have been because all your blood comes to your head. And what memory do you have
in that situation? It's like when you're kids, hanging upside down."

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