题目

第二节 完形填空（共20小题；每小题1，满分20分） 阅读下面短文，从短文后各题所给的四个选项（A、B、C和D）出可以填入空白的最佳选项，并在答题卡上将该项涂黑。 More than I realized, Dad has helped me keep my balance. When I was growing up, I was embarrassed to be seen with my father. He was severely disabled and very   31  , and when we would walk together, his hand on my arm for    32  , people would stare. I would inwardly feel uncomfortable at the unwanted   33  . If he ever noticed or was    34  , he never showed tA、B…H八种物质，有如图所示关系：其中D能使带火星的木条复燃，H是一种能使澄清石灰水变浑浊的气体，在②的反应前后B的质量和化学性质都不改变．试回答下列问题：（1）写出物质的化学式：A  C 、E 、F H ．（2）B在②中的作用是 ．（3）写出反应①和②的化学反应文字表达式： ， ．