2022英语周报八年级新目标46期答案

One possible versionDear MikeI'm glad to learn that you are going to take the Chinese Level Test next week. I'm wondering if you couldshare with me about your study. I'd like to offer some suggestions for the revision before the exam.irst, try to remember the important Chinese words one by one on your book. You'd better prepare a tinyFnotebook on which you can write down unfamiliar words and sentences and review them at any time. Second,it's also vital to practice your oral Chinese with natives. Last but not least, turn to your teacher and classmatesfor help whenever you have a problem.May you succeeed inyour exam.YoLi H

7.C【解析】本题考查万有引力与航天,目的是考查学生的推理能力。“天问一号”探测器在Q处点火减速变轨进入椭圆轨道Ⅱ线速度变小,选项A错误:探测器在Q点受到的万有引力大小F=,则在这两个轨道上受到的万有引力相等,选项B错误;根据牛顿第二定律有m=m,可知距离火星越远,加速度越小,则天问一号”探测器在P点时的加速度大于在Q点时的加速度,选项C正确;圆轨道I的半径大于椭圆轨道Ⅱ的半长轴,根据开普勒第三定律,轨道半径越大,运行周期越长,则“天问一号”探测器在椭圆轨道Ⅱ上的运行周期小于在圆轨道I上的运行周期,选项D错误。

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