2021-2022七年级新目标英语周报SXJ答案

16.D(考査万有引力定律的应用。设地球的质量为M,地球的半径为R,在地球表面附近对质量为m的物体有:GMm=mg,g=M:;设火星的质量为M,火星的半径为R',火星表面重力加速度为g,在火星表面附近对质量为m的物体有:g了.则有:8MMRRR)2=-·p2,得g'=Pg天问一号贴近火星表面做圆周运动的向心加速度an=g′=2g.天问一号贴近火星表面做圆周运动有:CK==m(R,设火星的平均密度为p,又有M=p·3R3,得p=故选项D正确,

第二节Then came the first class -- Chinese painting. The teacher showed us how to use a brush topaint bamboo on a piece of white paper. Then all the other students were in business. But it wasquite dificult for me. How could I hold the stiff brush and made it go as I wished? Hesitating for awhile, I tried dipping the brush into the ink bottle. When I took it out, drops of black ink fell onthe white paper. There was no bamboo, but big black dots!As I burnt with great embarrassment, Li Hua, who was next to me, gave me a warm smile. Ismiled back awkwardly She came over and demonstrated how to use the brush the brush movedacross the paper, and a lively bamboo appcarcd! With her help, I finally completed the task,although it was such a ugly one Aner that, we became good friends. She taught me Chinese whileI taught her English. We both made great progress in our studies. Yes, my mother was right. Asmile did make a difference

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