An enormous number of people in the world" s poorest countries do not have clean water or adequate sanitation______.
【正确答案】 B
【答案解析】解析：句意：世界最贫穷地区的很多人享用不到洁净的水和足够的卫生设施。facility设备，工具。capacity容量；能力。authority权威；权威人士。warranty授权；担保。