According to a UN report one third of the world population have noto clean drinking water

问题补充：

According to a UN report，one third of the world population have noto clean drinking water and health care.

A. means

B. approach

C. channel

D. access

答案：

A. means

B. approach

C. channel

(答案→)D. access

解析：本题考查名词。Means方法；approach 靠近；channel 频道。Have access to 有权进入…；可以使用….句意：根据联合国报告，三分之一的世界人口没有干净的饮用水和医疗照顾。