题目

为了证明CuO属于碱性氧化物，应选用的反应是（  ） A．与木炭混合后加热 B．与稀硫酸混合后加热 C．通入氢气后加热 D．通入一氧化碳后加热 答案：B请听下面一段材料，回答第1-2题。 1. What is probable relationship between the speakers? [     ]A. Teacher and student. B. Salesgirl and customer. C. Doctor and patient. 2. What does the man think will help the woman? [     ]A. Some medicine.B. Breathing slowly. C. Getting some test.