题目

几种短周期元素的原子半径及某些化合价见下表。分析判断下列说法正确的是（  ） 元素代号ABDEGIJK 化合价-1-2+4 -4+7 -1+5 -3+3+2+1 原子半径/ nm0.0710.0740.0770.0990.1100.1430.1600.186 A．A的单质是一种常见的还原剂                       B．E的含氧酸酸性比D的含氧酸酸性强 C．A、I、J的商子半径由大到小顺序是A>J>I            D．A的气态氢化物是强酸阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式。【1】John Snow demanded that the source of all the water supplies __________(examine).【2】__________ (expose) to Chinese culture in person, you will have a better understanding of it.【3】Will it be __________(convenience) for you to pick me up at the airport.【4】He didn’t tell her the truth ________ lack of confidence.【5】He looked backward constantly as if _________(follow) by someone.【6】According to a recent survey, about 25% of college students __________(have) part-time jobs.【7】Fortunately, someone who happened to be passing by called the fire department _________ (instant) the fire broke out.【8】Not until she spoke __________ I realize she was a foreigner.【9】The conference is __________(hold) next month.【10】__________(go) are the days when the villages were so quiet and peaceful.