英语周报 2018-2022 高考 31答案

Possible version:Tom thought for a moment and was about to agree, but he changed his mind. " I can't, BenYou know Aunt Polly wants the fence to be perfect. It has to be done very carefully.I don'tthink you can do it well enough. "He said to Ben, who looked a little discouraged. "Oh, Tom, I'llbe careful. Please let me have a try I would like to give you my apple if you agree, "requestedBen In the end, Tom gave up the brush with unwillingness on his face, but joy in his heartWhile ben worked at the fence in the hot sun Tom sat under a tree, eating the apple, andlanning how to get more help. many of his other friends walked past him. Each one came topllaugh, but remained to whitewash the fence because they all got interested in it. One by one, theywhitewashed the fence, each giving Tom a reward, big or small. If he hadn't run out ofwhitewash, Tom would have owned everything belonging to his friends. He had a most wonderful andidle Saturday, sitting in the shade and enjoying the rewards that his friends gave him

22(1)与气垫导轨平行(2分)2(2分)(2)m MDa(2分)解析:(1)调节定滑轮的高度,使定滑轮与小车间的细线与气垫导轨平行;小车通过光电门的速度为v=(2根据机械能守恒有m=号(m M1()·得到-m2mx,因此作出}一x图象如果图象是过原点的一条直线,且图象的斜率为m图,则机械能守恒定律得到验证

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