题目

Even before my father left us, my mother had to go back to work to support our family．Once I came out of the kitchen, complaining, Mom, I can't peel potatoes．I have only one hand． Mom never looked up from sewing．You get yourself into that kitchen and peel those potatoes, she told me．And don't ever use that as an excuse for anything again! In the second grade, our teacher lined up my class on the playground and had each of us race across the monkey bars, swinging from one high steel bar to the next．When it was my turn, I shook my head．Some kids behind me laughed, and I went home c20．下列现象或事实不能用金属活动性顺序解释的是（　　）A．金属铝比金属锌更耐腐蚀，说明锌比铝的金属活动性强B．实验室不能用铜和稀硫酸反应制取氢气C．锌粉、铁粉分别与等质量的溶质质量分数相等的稀硫酸反应，前者产生气泡的速率较快，说明锌比铁的金属活动性强D．不能用铁桶配制农药波尔多液