英语周报 2018- 40答案

第三节One possible versionParagraph 1And not tery long after that, he made a surprisingdecision. He decided to use all his rights, preparing for hislife at the remote island. In the first year he sent troopsveterinarians and animal trainers to kill the wild animals ortrain them for good use. The task was so huge but it wasworthwhile. Then the king sent a lot of farmers to start awide rice field and began to grow rice. Next he had manyfacilities, from hospital to school, built. After that he senta lot of educated people there. At last he sent all his fami-lies to the islandParagraph 2Finally the time came when the king had to be thrownatay to the island. With many strong soldiers catchinghimsmiled. He had prepared everything for thefinalWhen he was sent lo the island, the island had takenon a new look. Everybody there lived a comfortable life andthe king was welcomed warmly by his people. THcheered, "Long live the wise king. "The wise king livedhappily ever after. The clever people live now in the worldto prepare for their life in the future

35.[化学—物质结构与性质](1)D(2分)(2)①B2H6 H>B(各1分)(3)①a键、π键配位键(或极性键、配位键)(2分)②p3杂化(2分);乙二胺分子间的氢键数大于偏二甲肼分子间的氢键数目(1分)34:3(2分);y-Fe(1分)(4)6(1分):10-NAx2yinb(2分)2×93解析:(3)①K[Fe(CNo中存在离子键配位键和极性共价键、[C=N]中存在a键和x键。②氮原子形成四个a键,价层电子对数为4,采用sp3杂化;乙二胺和偏二甲肼的分子间均能形成氢键,但是乙二胺分子间的氢键数目大于偏二甲肼分子间的氢键数目,所以乙二胺的沸点更高。③根据晶胞的结构可知,8晶胞中铁原子的配位数为8,a晶胞中铁原子的配位数为6,所以两种晶体中铁原子的配位数之比为4:3;由于y-Fe空间利用率高,密度大,根据金属的热胀冷缩可知低温时铁的密度大。(4)六棱柱结构体现了六方晶系层与层之间原子的堆积方式,其实每个六棱柱可分割为三个底面为菱形的平行六面体品胞,即每个六面体品胞含有2个Nd原子;每摩尔金属品体含有NA/2个晶胞,一个六面体晶胞的体积为v=10-ysn60cm,可求得晶体密度为m3

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