题目

阅读理解Four days after Dad's 67th birthday, hehad a heart attack. He was lucky—he survived. But something inside him haddied—his enthusiasm for life was gone. My husband and I asked Dad to live with us on our small farm, hoping the fresh air would help him adjust. Within a week after he moved in, I regretted the invitation. He criticized everything I did. I became frustrated. One day I read an article about a nursing home. Several depressed patients' attitudes had improved dramatically when they were given dogs. So, I drove to the animal shelter that afternoon. As soon as I got there,设NA表示阿伏加德罗常数，下列说法正确的是（ ）A．常温常压下，23 g NO2和N2O4的混合气体一定含有NA个氧原子B．1 L 0.1 mol/L NaHSO4溶液中含有0.1 NA个HSO4-C．将0.1 mol FeCl3溶于沸水制成胶体，其中含有的胶体粒子数目为0.1 NAD．0.1molNa2O2固体与足量的H2O充分反应，转移0.2NA个电子