2022年英语周报七年级牛津答案

书面表达One possible version:NOTICEA sports meeting will be held in the playground of our school from next Thursday to FridayAs you know, the pressure of study is very heavy now, especially for those senior 3. So the purpose of the sports meeting is to letevery student get relaxed, as a result of which we students can live happily and heal thilyEveryone is welcome to take part in it. Those who perform excellently at the sports meeting will get prizes. But don' t take theresults so serously because taking part is more important than the result. Good luck to everyone!

4.D【解析】由图可知弹簧振子的振动方程为x=Ss!,将0.1s与t=0.2分别代入可得弹簧的形变量之比x1:x2=1:2,回复力之比为1:2,故A项错误;t=0.1s与t=0.3s两个时刻,弹簧振子的加速度相同,速度大小相等、方向相反,故B项错误;从t=0到t=0.2s的时间内,弹簧振子的动能逐渐减小,机械能逐渐减小,故C项错误;由图可知在t=0.2s与t=0.6s两个时刻弹簧的形变量相同,储存的弹性势能相同,故D项正确。

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