题目

---What does your brother look like ?A．He is very kindB．He is very friendlyC．He is very tallD．He is funny 答案：C解析:略4．现有下列4种物质：①Cl2、②NH3、③Na2O2、④NaHCO3固体、⑤Na2CO3固体．其中，常温下为黄绿色的气体是①（填序号，下同），能够作为呼吸面具或潜水艇中氧气来源的是③，遇蘸有浓盐酸的玻璃棒冒出大量白烟的气体是②，④和⑤在水中溶解度较大的物质是⑤．