2021-2022 学生双语报 八年级 X杭州专版 第45期答案

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参考答案：We are very blessed,"the mother said.She was so grateful that she couldn't hold back her tears.She wasgrateful not only because Alvin Bamburg took the great trouble to fulfill her daughters'wishes,but also felt solucky that he indeed planted warm seeds in her daughters'hearts.The kindness took root in the girls,soul.What they experienced in their childhood would make them remember forever.She believed that the world wouldbe colorful in her daughters'eyes.Alvin Bamburg was also excited at seeing the girls'happiness.As the man explained,delivering the giftsto the girls not only made them happy,but also him."If you can make just one person smile,not only will ithelp them,but it will make you feel much better.He was happy he could be a Santa Claus,and make the girlsbelieve in what they believe.He hold the belief that,in fact,anyone can be Santa's helper.They only need tohave a big heart and be willing to make others happy.

【答案】ABD【解析】由图像可知，=18时系统开起一起清动，有F,=,(M十m)g,则太一=2s,A正确：t=号。时物块与木板恰好发生相对运动，对物块根据牛颜第二定律有F,一4mg=ma,求得42=0.5，即物换与木板间的动摩擦因数为0.5，B正确：-t国像与t轴所国的面积等于速度的变化量，可求得：=2s时物块的选度大小为7m/s,此时物块的动能E,=铝J.片物决林择费能定显有网，-，=B一0，可加W,>是1，C增西音一28时同内木板胶匀加选达动，其加这大小。-m8一心M十m迟-方g,由固缘得=青时，本M板的建度大小为污ms,由匀变建直线运动规体得，2：末木教的选度大小为。m/心，可东得木长的位带大小m,木板与地面间因摩擦产生的热量Q=,(M十m)gx=。J,D正确，