河南英语周报九年级第20答案

4.C细胞间信息交流可以通过蛋白质与靶细胞上特异性受体实现,所以蛋白质分泌是重要环节,故A正确:经典蛋白质分泌需要通过囊泡来实现,体现细胞膜的流动性,故B正确;非经典分泌是经典分泌的补充,不是所有细胞都具有,故C错误:非经典分泌是一种不同于经典分泌的方式,是经典分泌的必要和有益补充故D正确。

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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