艾滋病的主要传播途径有

A．性接触

B．蚊虫叮咬

C．器官移植

D．母婴垂直传播

E．输入血液及血制品

Thai is the only way we can imagine _________the overuse of water in students' bathrooms.

A．reducing

B．to reduce

C．reduced

D．reduce