当代学生周报英语20182022答案

35.(1)[Ar3d(或1s2s2p23s3p23d)(1分)(2)[>As>Se>(e(1分)分子品体(1分)sp(1分)(3)V形(1分)低(1分)水分子间存在氢键,函化氢分子问不存在氢键(1分)(1)①+3(1分)N、C1(1分)CC1(或SF等)(1分)C8(分()①23a(2分)e923a6N、×10(2分)解析:(5)①Mg原子形成的六元环的中心原子Mg与环上直接相连的两个Mg原子形成等边三角形,边长为amm,则中心Mg原子到棱边的高为am,则B原子层六元环中处于对位的B原子核间距为等边三角形中心到顶点的距离(。m×2)的2倍,即am×2×2=2anm;②晶胞中六边形的面积一33a2m2,则品胞的体积为=yabm3;晶胞中含有Mg原子数为12×+223,B原子数目为6,则品胞的质量为N,8M4g,则MgB晶体的密度是24×3+11×6138,8m“3bN、×10g·cmb

One possible versionSeveral minutes later, the ice broke suddenly and Harry's feet sank into the water. It was noep, but his legs got wet to the knees. Harry was so upset that the accident would delay hisschedule. He had to find some firewood to build a fire to dry his clothes. He pulled off his glovestook out his matches, and lighted the fire. Seeing the burning fire, he had thought he was safe. Butsuddenly, without warming, a heavy mass of snow dropped down. The flame of hope was put outUnluckily, his dog ran away and the fear of death came over Harry. He had no choice but torun to save himself. However, he did not feel his feet when they hit the ground. Having falleneveral times, he decided to rest a while. As he lay in the snow, he noticed he was not shaking. Hecould not feel his nose or fingers or feet. A feeling of horror came into his mind. It was when herealized he was going to die that he heard a bark and the noise his friends made

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