Most of us take clean drinking water for granted. However, in many developing
countries, obtaining water safe enough for humans to drink is quite a task. Luckily,
scientists around the globe are taking this problem seriously and coming up with some
creative solutions. Water purification has moved far beyond simple carbon filtration or
using additives such as chlorine and iodine. Today's unique bacteria removal designs
include evaporation, ultraviolet radiation, and the use of porous ceramic.
How does the organization of the passage effectively convey the author's message?
2
1
The comparison between new water filtration systems to old ones makes
it clear why older systems are outdated.
The statement at the beginning alerts readers that the passage will
address how they can obtain safe water.
3
The list of different designs at the end supports the idea that scientists are
taking the issue seriously.