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    Mick Polly，an owner of a toy store，lives with his teenage daughter Carolina in Kentucky．He is known as the Bike Man．Over the past five years，Mick has built hundreds of bikes for needy kids．

    One day in 2012，a 13﹣year﹣old boy with a broken bike walked by Mick's house．"I was working in my garage（车库），and he asked if I could fix it，"says Mick，now 53．

    The boy's bike had a broken wheel．Mick sent a post（帖子） on Facebook，asking his friends if they had the needed part．One friend saw the post and gave away two used bikes．Mick took parts from each to build a new set of wheels for the boy．

    Soon after，Mick repaired a bike for the boy's brother and fixed one for his sister．Word spread，and during the year，he had fixed up lots of bikes for local kids whose parents were not able to afford new ones．

    "People are throwing away bikes day and night，"says Mick．

    Mick puts the bikes and bike parts in his garage．"I take off the good tires or the handlebars or the seats and use them，"he says．

    Up to now，the bike man has repaired hundreds of bikes and given away nearly 700newly repaired bikes．They're free，but the kids must agree to two things：They have to learn how to put waste things to good use and they have to try their best to study in school．

    If a kid's grades are low，Mick requires a teacher's note"saying that you're doing your best，"Mick says．Mick also hopes the bikes will get kids off the sofa．"When I was growing up，we all rode our bikes，"he says．"Hopefully these kids can get some exercise．"

如图所示为用热敏电阻R和电磁继电器L等组成的一个简单的恒温控制电路，其中热敏电阻的阻值会随温度的升高而减小．电源甲与继电器、热敏电阻等组成控制电路，电源乙与恒温箱加热器（图中未画出）相连接．则（　　）

    An astronaut's work may sound exciting, but living in space isn't as fun as you think. The website www.space.com lists the disadvantages of living in space. Here are some of them.
    When astronauts work outside the station during spacewalks, they have to wear special gloves. The gloves are very tight. They can hurt the astronauts' fingernails(手指甲) and even make them fall off.
    In space, you don't have many choices in what you eat. It's hard to get fresh fruits and vegetables. It is not OK to eat bread because it leaves crumbs(碎屑). Crumbs could fly around everywhere.
    In space, it is impossible to have a good shower because water can fly all over the ship and break the machines. Astronauts have to use a special water-shooting(喷水) gun and a washcloth.
    Astronauts lose their bone strength quickly during their stay in space. So far, there is no way to solve this problem. They do exercise while they're in space to try to keep their bones strong as long as possible.
    Perhaps the hardest part of life in space is the feeling of loneliness. Astronauts sometimes have to spend weeks and even months away from Earth. They miss their friends and families.

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