英语周报答案2019 2022 第四期

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!

13.D【命題意图】本题考查电化学原理和应用。【解题思路】由装置图可知,a电极区Cr发生氧化反应生成Cr2OF-,则a为阳极,b为阴极。电解池若选择活泼金属为阳极,通常是阳极本身失电子,A项正确;阴极反应式为2H 2e-—H2↑,隔膜X为阳离子交换膜,B项正确;阳极电极反应式为2Cr2 7H2O-6e-—Cr2O- 14H ,C项正确;铅蓄电池负极的电极反应式为Pb(s) SO--2ePbSO4(s),当负极增重48g时,转移的电子数为1mol,标准状况下b电极区产生气体的体积为11.2L,D项错误。

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