2022八上英语周报第三期答案

21.(10分)(1)E先迅减少,不久后达到对平衡的水平(2分)(2)向叶绿体中注入被放射性间位素标记的B物质,并将植物置于光照等其他条件均适宜的环境中一段时间后,采用二定的方法橡测光合产物葡萄糖中是否出现了放射性。(3分)(3)抑制②24D③甲组枝条上叶片的光合速率低于乙组(2分)

书面表达One possible version:NOTICEA sports meeting will be held in the playground of our school from next Thursday to FridayAs you know, the pressure of study is very heavy now, especially for those senior 3. So the purpose of the sports meeting is to letevery student get relaxed, as a result of which we students can live happily and heal thilyEveryone is welcome to take part in it. Those who perform excellently at the sports meeting will get prizes. But don' t take theresults so serously because taking part is more important than the result. Good luck to everyone!

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