题目

阅读理解。 Today is Sunday. It’s seven thirty in the morning. It’s fine. Kate and her parents are going to the Great Wall. Kate’s father is a doctor. Her mother is a teacher. Now they’re getting on a big bus. There are twenty-two people in it. Some are English, and some are American and Japanese. They look very happy. They’re going to the Great Wall, too.There are four Chinese on the bus. A young woman, she’s a driver. A young man, he’s a guide(导游). My father and I are going to the Great wall, too. 判断,与短文相符的用“√”表示，与短文不相符的用“CuI是一种不溶于水的白色固体，它可以由反应：2Cu2++4I-=2CuI↓+I2而得到。现以石墨为阴极，以Cu为阳极电解KI溶液，通电前向电解液中加入少量酚酞和淀粉溶液。电解开始不久，阴极区溶液呈红色，而阳极区溶液呈蓝色，同时有白色沉淀生成。下列说法中正确的是A．对阳极区溶液呈蓝色的正确解释是：2I--2e-=I2，碘遇淀粉变蓝B．对阳极区溶液呈蓝色的正确解释是：Cu-2e-=Cu2+，Cu2+显蓝色C．阴极区溶液呈红色的原因是：2H++2e-=H2↑，使阴极附近OH-浓度增大，溶液显碱性，从而使酚酞变红D．阴极上的电极反应式为：Cu2++2e-=Cu