2022-2022年英语周报 高三 牛津答案

7.CD解析:要保证小球能通过环的最高点,小球在最高点最小速度满足mg=m,对小球从最低点运动到最高点的过程应用机械能守恒定律得m=m+2mg,可得小球在最低点瞬时速度的最小值为√5gr,A项错误、C项正确;为了不使环在竖直方向上跳起,则在最高点球有最大速度时,对环的压力为3mg,满足4mg=m,从最低点到最高点由机械能守恒定律得2m=2=mn2+2mgr,可得小球在最低点瞬时速度的最大值为2√2g,B项错误、D项正确。

Paragraph 1On Monday morning, hiding behind the window, wesoon saw what we were waiting for. It turned out that there They were too funny as they hopped away holding theirwere three of them from our school. They sneaked up on injured feet. We just couldn't contain our happiness andour snowman and sneered. Taking their places on either i excitement. With a hearty laugh, we came out of hidingside, they pulled back their legs to deliver powerful kicks. and sprang into the yard from inside the house. " An eye forBut the moment they hit the hard ice block of the base,. an eye! Justice done! "We yelled behind them. And thatsneers turned into shock, then agony and tears. They was the end of our problems with the snow bullies. Everhowled and cursed, gritting their teeth and stomping their i since then, our snowman was kept guarded and intact untilhappily melted into spring water and finally wove into ourParagraph 2sweetest childhood memoriesSeeing their pained looks, we couldn t help laughing

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