2022英语周报八年级答案第5期

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

6.C【解析】氧化锌晶体属于离子晶体,A项正确:O原子与O原子的最短距离为面对角线的一半,即2apm,B项正确;由晶胞示意图,取顶点Zn原子来看,其周围等距且最近的Zn原子为面心上的Zn原子,顶点Zn原子属于12个面,故Zn原子周围等距且最近的Zn原子数为12,C项错误;由图可知,该晶胞含4个O原子(晶胞内),Zn原子位于晶胞的顶点和面心上,故Zn原子的数量为8× 6×方=4个,D项正确

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