题目

W、X、Y、Z四种短周期元素在元素周期表中的相对位置如图所示，W的气态氢化物可与其最高价含氧酸反应生成离子化合物，由此可知（     ） WXYZ A．X、Y、Z中最简单氢化物稳定性最弱的是Y B．Z元素氧化物对应水化物的酸性一定强于Y C．X元素形成的单核阴离子还原性强于Y D．Z元素单质在化学反应中只表现氧化性完形填空(阅读下面的短文，然后从四个答案中选出最佳答案) Thomas Edison 1 a famous American scientist. He was born 2 1847. When he was 3 child, he liked to 4 how things worked. He was in school 5 only three months. He 6 his teacher a lot of strange questions. Mostof them 7 his lessons. 8 teacher thought the boy 9 bright and was not worth 10 11 he told this to Edison's mother, she took her son 12 school. As she 13 a teacher, she taught him 14 . The boy read 15 . Soon he 16 very interested in science, 17 the age of ten, Edison 18 a chemistry lab for himself. Ever since then, he never stopped searching for new and 19 ways 20 . 1． [　　] A．beB．is C．wasD．were 2． [　　] A．onB．in C．atD．to 3． [　　] A．aB．an C．theD．\ 4． [　　] A．findB．found C．find offD．find out 5． [　　] A．forB．in C．toD．at 6． [　　] A．was askedB．asked C．asksD．has asked 7． [　　] A．have nothing to do withB．has nothing to do with C．had nothing to do withD．has nothing to do about 8． [　　] A．AB．An C．TheD．\ 9． [　　] A．wasB．is not C．were notD．was not 10． [　　] A．teachB．teached C．taughtD．teaching 11． [　　] A．WhereB．When C．WhyD．How 12． [　　] A．out ofB．of C．out fromD．from 13． [　　] A．have beenB．had been C．has beenD．were 14． [　　] A．himselfB．herself C．myselfD．themselves 15． [　　] A．a lot ofB．lot C．lots ofD．a lot 16． [　　] A．becomeB．had become C．becameD．becomes 17． [　　] A．OnB．At C．InD．To 18． [　　] A．had already builtB．has already built C．buildD．has already built 19． [　　] A．goodB．best C．betterD．well 20． [　　] A．to do thingsB．do things C．did thingsD．to doing things