A-A+
A．We should drink more hard water.B．We should
问题详情
A．We should drink more hard water.
B．We should drink mere soft water.
C．Ground water is good for the elderly people.
D．Ground water has to be, treated before we drink it.
参考答案
正确答案：D
解析：事实细节题。从"Scientists suggest that all the ground water should be specially treated before it is sold. "可知，科学家建议地表水必须在经过处理后才能饮用。
