题目

—Is Sunday the last day of a week in the UK, Peter? —No, it's the _________ day of a week. A . first B . second C . sixth D . seventh 答案：A下列叙述正确的是A．95℃纯水的pH<7，说明加热可导致水呈酸性B．pH=3的醋酸溶液，稀释至10倍后pH=4C．0.2 mol?L-1的盐酸，与等体积水混合后pH=1D．pH=3的醋酸溶液，与pH=11的氢氧化钠溶液等体积混合后pH=7