2022英语周报七年级下册19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.

1.A【解析】根据对照组、实验组1、实验组2的结果,可以推测相对湿度越大,小麦净光合速率越大,故增加麦田环境的相对湿度,可降低小麦光合作用午休”的程度,A项正确;根据实验结果,可以推测中午时对小麦光合速率影响较大的环境因素是相对湿度,其依据是相同温度(36℃)条件下,小麦光合速率随相对湿度的增加而明显加快,B项错误:在实验组中,比较实验组2,3、4可推知,相对湿度相同条件下,小麦光合作用的最适温度在31℃左右,而第4组的光合速率低的原因是温度较低,因此若适当提高第4组的环境温度能提高小麦的光合速率,C项错误;实验组2、3、4的湿度相同,自变量是温度根据实验结果可知,实验中三种温度中,31℃时小麦光合速率最大,由于设置的三种温度梯度过大,不足以说明31℃是最适温度,还需设置温度梯度更小的实验,探究最适温度,D项错误。

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