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听力原文：M: Charles enjoyed his two-week drive through South China.
W: Yes, he said that he saw much more than he would have travelling by bus or train.
How did Charles travel？
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听力原文：W: Hi, John!
M: Oh! Hi, Laura! What are you doing here？
W: Uh, I'm usually here on weekends. It's my dad's shop. So you are looking for a bike？
M: Yeah. Now that the weather is warming up, I think I should get some exercise instead of taking the bus all the time.
W: Well, you come to the right place. What would you like？
M: Well, I don't want a racer or a touring bike or anything. Mostly I'll just use it to get me back and forth from work.
W: How far is that？
M: About four miles.
W: Are there a lot of hills on the way？
M: Some. But maybe I should tell you at first that I only have 150 dollars. Can I get anything decent for that？
W: Well, you are not going to get anything top of the line. But we do have a few trade-ins in the back that are in good condition.
M: That sounds good.
W: And you are right. For the kind of ride you are going to be doing, the most important thing is comfort. You'd better make sure it's the right height for you. Follow me and I'll show you what we've got.
Why is Laura at the bicycle shop？
听力原文：M: Prof. Kennedy has been very busy this semester. As far as I know, he works until midnight everyday.
W: I wouldn't have troubled him so much if I had known he was so busy.
What do we learn from the conversation？
Why did Rachel move to the United States？
The announcement of the discovery Wednesday comes just a day after a team of European re- searchers said they found blocks of ice just under the surface of Mars near the equator. The Europeans said the ice, between 2 million and 5 million years old, could serve as storehouses for life. The new bacterium thrives under a microscope despite having been thawed from ice dating back some 32,000 years, to the Pleistocene era. Living bacteria are stained green.
Hoover said the creatures he has found might be able to survive in their suspended state for millions of years. The discovery opens up a whole new possibility that a future mission to Mars might be able to retrieve any life that's there. "Ice samples from this [Martian ice] sea could con-rain cryopreserved microorganisms if life ever flourished on the surface of Mars," Hoover said in a telephone interview. He is particularly excited about the instant revival qualities of the creatures found in Alaska. "You might actually get them growing in pure culture," he said of the potential Martian cousins. It would be a "wonderful way of retrieving intact, viable Martian organisms, if they are there."
Water does not guarantee life, but it is a crucial ingredient. Hoover said the Martian ice blocks are so near the surface that they might partly melt in summer, creating underground pools of water that would allow any microorganisms to grow and reproduce. (Life above ground is considered unlikely due to Mars' dry surface conditions and intense radiation. )
What does the discovery of deep-freeze bacteria mean to us, according to the passage？
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