题目

Whenever I recall my childhood, there is one thing I remember clearly. My father used his ______ to let my mother_______ her parents who lived far away.There were just my younger brother and myself in the ______. One evening, our father came home and there was no ______, not even a piece of bread. My father had no money and he was as ______ as we were. My brother and I went to bed without having anything. ______ I knew from the expression on my father's face that he could not______ us be hungry for long. He left the house, and about two hours later he______ and woke us up. He had two small pot在同温同压下，把等体积的空气和二氧化碳混合，并使之在高温下跟足量的焦炭反应。若氧气和二氧化碳最后全部转化为一氧化碳，则反应后气体中一氧化碳的体积分数约是(    ) A．0.60 B．0.64 C．0.70 D．0.75