2021-2022英语周报56期答案

15.C放电时铁是负极,负极失电子发生氧化反应,生成的Fe2 与OH-结合生成Fe(OH)2,电极反应式是Fe 2OH--2eFe(OH)2,A错误;放电时正极发生还原反应,每转移2mol电子,正极上有1 mol Ni2O被还原,B错误;充电时Ni(OH)2在阳极失电子发生氧化反应,电极反应式是2Ni(OH)2-2e- 2OHO3 3H2O,C正确;根据总反应可知,放电时生成物是Fe(OH)2和Ni(OH)2,因此该蓄电池的电极可浸在某种碱性电解质溶液中,D错误

第三节One possible version:Paragraph 1Steve and Zach hadnt gone far uhen there toas afamiliar bark. Brady came bounding, stopped directly infront of Steve and hit him with his head, pushing him backtowards the slope. But Steve didnt get it. Then Bradygrabbed the boy4 Jeans and started pulling. The messagewas clear, but Steve hesitated. Of course he rememberedBrady saving his unele's life when the dog was much younger.Was he still sharp enough to get them through this?Paragraph 2Brady pulled again, in spite of the boys disbelief, iurgently. OK, big guy, "seeing the fire was touchingunderbrush nearby, Steve made up his mind.Brady ledthem back down the slope and into the trees. Several timesthe big dog stopped. Often he changed directions to find theright way. The boys were so tired but the dog bullied bothboys to go on. Steve was almost numb when he heard itthe wonderful sound of rushing water! They made it back tothe river

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