2018-2022英语周报九年纪新目标答案

【书面表达2】What a mess! "April frowned. Though she had been longing for a non-Earth Daybirthday, it was difficult to turn a blind eye to such a mess. She turned around to her friends, " Howabout picking the trash first? "" Her proposal was quickly approved by others and soon they were inbusiness. Aprils mum grabbed some gloves from the trunk while her dad managed to removethose shopping bags in the trees. With the bags, April and Bailey collected scattered bottles. Bythe drain, Josie and Tyler made great efforts to clear the blockage Many hands make light workIn a short while, three bags were filled with cans and newspapers to recycleApril looked at the collected rubbish and smiled. Then she looked up at her friendsTheir neat clothes for the birthday party were soaked with sweat. but their faces glowed withsatisfaction. It felt so good to do something for the earth. Happy Earth Day, everyone, " said AprilNow we are ready for Maze Craze. ""Happy Birthday, April! "shouted her friends. "Im so luckyto have been born on Earth Day!("Wow, another earthy birthday, )April thought to herself."AComposts Carnival may be a good idea for next year.

8.AC【解析】小球离开绝缘半圆管后,根据牛顿第二定律可得√9E)+(m)1m3,所以E=A对小球从A到B的运动过程应用动能定理可得2mgRqER=2mi,所以v=√3R,小球在B点受重力电场力和轨道的支持力作用,故竖直方向的向心加速度为a=B=,水平方向的加速度为a′=E_4所以在B点的合加速度为a合g,A正确;对小球进行受力分析,如图所示,由于gE≈4mg,所以tan330=53°,在等效最低点,小球对圆管的压力最大,关于等效最低点与圆心连线对称的两个位置,小球对圆管的压力大小相等,通过分析可知,小球从D到B的过程中,在B点对圆管的压力最小,B错误;小球从B点离开后在水平方向做匀减速运动加速度a=4g,则从B点R运动到C点的水平位移为x=2=2,C正确;设小球从B点运动到B点正下方所需要的时间为t,根据水平2方向的运动规律可得t=-,在此过程中,小球向下运动的距离为y=242=2R,D错误。故选ACDNBmg

以上就是2018-2022英语周报九年纪新目标答案，更多英语周报答案请关注本网站。