题目

阅读下面短文,从短文后各题所给的四个选项(A、B、C和D)中,选出可以填入空白处的最佳选项。 From the time Iwas little until I turned 15, my mother would bring me to the houses shecleaned and I'd help her. I clearly1the summer before firstgrade, when I was2the furniture in Mrs.Belinda's living room. That's3I told my mom I wanted togrow up to be a(n)4like her. I think I wasjust a little kid who5her mom, but she took me6. She sat down next to me,saying that she had to clean houses in the United States because she didn'thave the educational7that I had. That's when Ir对下列各气体进行“喷泉”实验，在干燥的烧瓶中分别装满下列气体，打开止水夹形成喷泉，其中溶液不能充满烧瓶的是（）。A.NH3        B.NO2C.HCl          D.体积比为4∶1的NO2和O2的混合气体