单项选择题
下列哪些一种溶液可以做缓冲溶液？
A．HAc + 少量HCl
B．HAc + 少量NaOH
C．HAc + 少量NaCl
D．HAc + 少量H2O
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多项选择题In the eye of ancient Chinese, one, three, five, seven and nine are numbers of Yang, while two, four, six and eight are numbers of Yin. If both of the numbers of the day and the month are Yang numbers, such as 01/01, 03/03, 05/05, 07/07, 09/09; it leads to an imbalance of Yin and Yang. With constant worship for Yin-Yang balance, in those days, therefore, people would（ ）
A、 take a bath
B、 drive off bad luck
C、 offer sacrifices to gods
D、 pray for good luck
