A.However，some new illnesses will appear. B.Biotechnology（生物技术）will make food better and healthier. C.Some cities on water will have two floors. D.They will be much safer. E.They will have pictures that，as clear as photos.

Cars will run on solar power or electricity and will be much cleaner.（1）　 　For example，if you are too close to another car or if you are driving dangerously，your car will slow down by itself.

    Since there won't be any spare place，new cities will have to be built in the sea.（2）　 　

    People will live on the upper floor，the lower floor will be used for traffic，shops and factories.

    （3）　 　 Plants that are not influenced by insects （昆虫） or illnesses will be developed.The taste of fruit and vegetables will be better and food will be kept longer.

    New technology will be used to make TVs that are only 5 cm thick.（4）　 　 Electrical appliances（电器）will be quieter and will be controlled by computer.They will also use 50% less power.

    Many new ways to treat illnesses will be successful using products of genetic engineering （基因工程）.Treatments will be found for the flu （流感）and the common cold.（5）