今年我国西南地区遭遇罕见旱灾，造成人畜饮水困难，粮食减产。没有水就没有生命。爱护水资源是每个公民的责任和义务。请问：

（1）保护水资源要从哪两个方面入手？                                                        

（2）要净化含有许多杂质的水，可利用哪些方法?                                                    

Passage Three

Which is NOT true according to the passage

A．Growth in height of a body is an example of maturation.

B．Maturation is the development of organization as a function of time or age.

C．Maturation is a process of accumulation of personal experience.

D．Learning plays a vital role in changes of a child’s behavior.