题目

Shundagarh is a village on India’s east-facing coast. It is a village of simple mud and grass houses built on the beach just above the waterline. The Khadra Hills rise immediately behind the village, to a height of one hundred and fifty meters. A simple, good-hearted old man, whose name was Jalpur, farmed two small fields on the very edge of these hills. From his fields he could see the fishing boats that traveled up and down the coast. He could see the children playing on the sands; their mothers washing clothes on the flat stones where the Shiva River flowed into the sea; and their 向滴有酚酞的NaOH溶液中，逐渐滴入稀盐酸至过量，下面叙述正确的是 A．溶液由红色变为无色，PH逐渐增大  B．溶液由无色变为红色，PH逐渐减小     C．溶液由红色变为无色，PH逐渐减小  D．溶液颜色不变，PH逐渐增大