英语周报20192022高考答案

2.B根据题图可知,纵坐标表示处理后根的质量变化量,当蔗糖溶液浓度相对较高时,根细胞失水,质量减轻,蔗糖溶液浓度相对较低时,根细胞吸水,质量增加,因此可推断出五种蔗糖溶液的浓度从小到大的顺序为丙、戊、甲、丁、乙,A错误。根据题干信息可知,植物根细胞吸水能力与根细胞中细胞液的浓度有关,则细胞液浓度越大,根吸收水的能力越强,据图推断,正常情况下,马铃薯幼根细胞细胞液的浓度大于物种a幼根细胞细胞液的浓度,B正确。在甲溶液中,马铃薯吸水和失水处于动态平衡,则甲溶液属于马铃薯的等渗溶液,物种a会失去水分,所以不能正常生长,C错误。当马铃薯质量不变时,水分子的跨膜运输达到动态平衡,D错误。

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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