英语周报 高三新课程22期答案

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!

19.D)【解析】淀粉的组成元素是C、H、O,不含氮元素;本实验只做了4个不同氮素水平的实验,并不能得出随着氮素水平的升高,该植物光合速率持续增大的结论;氮素水平从300到600kg·hm-2时,植物的净光合速率变化不大不只是由于气孔导度的限制,还有色素含量的限制;从表格中已知净光合速率,若耍测定该果树叶片O2的产生量,即总光合速率,则还需在榘暗条件下测定叶片O2的吸收量。故选D。

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