根据短文内容，选择最佳答案。
Scientists say life will be very different in 2050.
First，there will be no TV channels（频道）in 2050.People will choose a program from a computer and watch it on TV.In 2050，we will get information from the computers only.
Second，water will be a big problem in 2050.In many places，people won't have water to drink.
Third，cars will use new and clean fuels and they will go very fast.There will be a computer in every car.And the computers will control the cars and there won't be any accidents（事故）.
