A-A+
A．Rain water dissolves materials as it comes d
问题详情
A．Rain water dissolves materials as it comes down a base of limestone or shale.
B．People put dissolved materials into the soft water.
C．People treated hard water with special medicine.
D．Rainwater mixed with seawater.
参考答案
正确答案：A
解析：事实细节题。从“Rainwater dissolves materials as it comes down and this results in water's taste and hardness．”可知，雨水下落时溶解矿物质，使地表水有了味道和硬度。
