选字组词

    （刚    钢）强____         难（到  道）____

    （曾    成）经____         昏（到   倒）____

      友（谊    宜）____         （奇   崎）岖____

     捣米（摇   谣）____         （再  在）见____

为探究乙炔与溴的加成反应，甲同学设计并进行如下实验：先在实验室制取一定量的乙炔气体，并将气体通入溴水中，发现溶液褪色，即证明乙炔与溴水发生了加成反应；乙同学发现在甲同学的实验中，褪色后的溶液里有少许淡黄色浑浊物质，推测甲制取的乙炔气体中可能含有少量还原性气体杂质，由此他提出必须先除去杂质，然后乙炔再与溴水反应．

请你回答下列问题．

    Mick Polly, the owner of a toy store, lives with his daughter Carolina in Kentucky, USA. People also call him the Bike Man because over the past few 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 repair (修理) it," said Mick.

    The boy's bike had broken wheels (车轮). Mick posted (发布) a picture on Facebook, asking his friends if they had the parts he needed. One friend saw the picture 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 one for his sister. During the year, he repaired lots of bikes for kids whose parents didn't have enough money for new ones.

    People are throwing away (扔掉) bikes every day," said Mick.

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

    Up to now, Mick has repaired hundreds of bikes and given away almost 700 newly repaired bikes. They're free, but the kids must agree to try their best to study in school.

    Mick also hopes the bikes will get kids off the sofa. "When I was growing up, we all rode our bikes," he said. "Hopefully these kids can get some exercise."

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