2022英语周报高一课标28答案

4,【解析】由于当时已经精确测得自由落体的加速度g、地球半径R、月地间距r及月球公转周期T,由此可计算得出月球运动的向心加速度Q,只需验证a=是否成立即可,故B项正确,A、C、D项错误。

One possible version:A Meaningful CleanupIn order to encourage us students to participate in volunteer activities and prevent virus spreading, our classorganized a meaningful cleanup in a nearby community last Sunday morning.We gathered on the playground and then we walked in a line to the community. Under the guidance of ourteachers, we were divided into two groups. Students in Group One did some cleaning, like sweeping floors andmopping stairs. Meanwhile, students in Group Two disinfected the buildings. With everyones efforts, we fin-ished the task successfullyIve benefited a lot from the activity. It makes me learn teamwork and I ve realized community health is cru-cial and that I can also do something worthwhile for our community.

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