已知H2O2分子的空间结构可在二面角中表示,如图所示,下列有关H2O2结构的说法正确的是( ) A. H2O2中有3个σ键、1个π键 B. H2O2为非极性分子 C. H2O2中氧原子为sp3杂化 D. H2O2沸点高达158 ℃,可推测H2O2分子间可形成氢键 答案:【答案】CD 【解析】 【详解】A.过氧化氢分子内氧与氢原子、两个氧原子之间都是单键,所以H2O2中有3个σ键,没有π键,故A错误; B.H2O2分子中正负电荷中心不重合,极性分子,故B错误; C.H2O2中氧原子周围有两个单键和两个孤对电子对,所以氧原子为sp3杂化,故C正确; D.氢键主要存在于N、F、O三完形填空(每小题1分,共10分)Mary:Hello, Helen! Can you give me some__ about learning English?Helen: Of course.Mary : I want to learn English____ . But I’m not good at reading and __ Helen : Why ___ you write down the correct spelling next to the __ ?Mary : OK. Can you give me some other advice?Helen : You___ read a newspaper in English every day. Try ___ eight or ten __ a day.Mary : What else?Helen : You can talk about the films or songs __ your friends. And why not listen to the teacher __ in class?Mary : Thank you.【小题1】 A.idea B. advice C. message D. information 【小题2】 A.good B. fewer C. well D. less 【小题3】 A.writing B. wrote C. listen D. writes 【小题4】 A.not B. didn’t C. doesn’t D. don’t 【小题5】 A.mistakes B.captain C. school D. words 【小题6】 A.can’t B. want C. can D. shouldn’t 【小题7】 A.forget B.to forget C. not forget D. to write 【小题8】 A.books B. articles C. sentences D. words 【小题9】 A.with B. and C. for D. by 【小题10】 A.careful B. not careful C. carefully D. careless