阅读下面材料，从每题所给的A、B、C、D四个选项中选出最佳选项。
Hi,
This is the year 2070. I have just turned 50 years old, but I look like a person of 85. I get bad kidney (肾脏) problems because I don't have enough water to drink. I'm afraid I live to the end of the world.
I remember when I was five years old, everything was very different. There were lots of trees in the parks. I could enjoy a shower for half an hour. At that time, women all had beautiful hair. Now, we have to cut hair off from our heads so that we can keep them clean with no water.
I remember there were "Save Water" warnings (警告) in many places, but nobody thinks about them. Now, all the rivers and lakes are either dry or polluted (被污染的). Water is more expensive than gold.
Years ago, doctors asked people to drink eight glasses of water a day. Nowadays, I can drink only half a glass. Most of us are sick and lots of young people look old.
Because there are no trees, we have to pay for air. It is not very fresh, poor people die young.
When my son asks me about my childhood, I tell him about how enjoyable it was and how healthy people were. When he asks, "Why is there no clean water now?", I feel sad. I am the one who turned a blind (瞎的) eye to all the warnings.
I wish this letter could take a trip back in time and it would make people in the 2020s truly know the importance of saving water.
Natalie
B. 
C. 
E. 