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

4.C【解析】河流袭夺前,沂河上源流向东北方向的大张庄。袭夺发生后,东周河水位低,结合等高线凸出方向,沂河上源河水流向东周河。出现倒转的河段是CE段,C对。AB段、BC段没有改变流向,A、B错。EF段没有水流,形成了分水岭,D错。故选C。5.B【解析】沂河上源被袭夺后,会导致FG河段缺少水源补给,宽谷内水流变细小,B对。BC河段水流速度不受影响,A错。CD河段汇入了BC段水量,河流径流量增加,C错。FG河段径流量减小,大张庄夏季暴雨洪涝减少,D错。故选B。

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