2022英语周报八上第三期答案

12.C【解析】1个D210分子中含有的质子数、中子数电子数均为10,2gD21O的物质的量为01mo,含有的质子数、中子数、电子数均为NA,A项正确;78gNa2O2和Na2S的混合物的物质的量为1ml,含有的、一Na+数为2NA,B项正确;标准状况下,5.6LO2的物质的量为0.25mo,作氧化剂时转移的电子数不一定为NA,C项错误500mL2mol·L1N2O溶液中含C的微粒总数为NA,D项正确。

reading, with a confused look on her face. Dannis stoodup,glared at her and shouted, "You stole my wallet! "Thecrowds began to gossip. The girl turned deadly pale, loo-king so restless that words failed her. A strange silencehung in the air. Abruptly, she leaped from the seatParagraph 2The gird ran and Dannis ran after her. After a whileDannis finally grabbed her by the arm. At exactly thatmoment,a policeman approached them and asked aboutwhat happened. Dannis hastened to explain it while the girlfrowned with a shake of her head. After further enquiriesthe policeman took out a wallet and handed it to Dannisadding that someone had found it in the toilet. What a mis-take he had made! Overwhelmed by guilt, Dannis made anapology to the girl第三节One possible versionParagraph 1A seat beside her was empty, and Dannis occupied itHe felt a wave of anger swept over him, "Where is my wal-let? he yelled. The black-haired girl glanced up from her

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