教育周报2020~2021第29期答案

【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.

13.(1)如图所示(2分)(2)3(1分)0.6(1分)(3)如图所示(2分)【解析】(1)电压从零开始变化,滑动变阻器应采用分压接法,小灯泡电阻远小于电压表内阻,所以电流表应采用外接法,实验原理图如答案图所示。(2)小灯泡的额定电压U=3V,所以电压表的量程应选用3V,额定电流I=0.4A,所以电流表的量程应选用0.6A。(3)根据电路图,把图中的实验器材连成符合要求的实验电路,如答案图所示。

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