20英语周报高二牛津答案

2(爸漏@C唐什么命题人考查物质跨膜运输方式的相关知识。这么考⑨细胞壁具有全透性,蔗糖和水能自由通过红心萝卜细胞的细胞壁,A项正确;蔗糖溶液甲中红心萝卜A的质量没有变化,而红心萝卜B质量减小,说明细胞失水,所以红心萝卜A细胞液浓度大于红心萝卜B细胞液浓度,因此红心萝卜A的细胞液渗透压比红心萝卜B的高,B项正确;蔗糖溶液为丙时,红心萝卜B的细胞通过自由扩散吸收水分子,C项错误;蔗糖溶液为甲时,水分子进出细胞达到平衡,此时仍有水分子进出红心萝卜A的细胞,D项正确。

【佳作展台】A Debate in Our ClassTo celebrate International Volunteer Day andenrich our campus life(非谓语动词短语作目的状语),our class held a debate about whether high schoolseniors should volunteer(宾语从句) on December5thOpinions are divided on the topic. The majorityof students believe that we should volunteer. They sayvolunteering can not only increase our interaction withothers but also equip us with new skills( not onlybut also..结构). Others don' t think much ofvolunteering. They think study is their top priorityand volunteering may take up their study timeIn my view, every effort counts and volunteeringcan benefit everyone- both help-givers and help-receivers. So if possible, we allloUengageourselves in the voluntary work

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