题目

Life in the 22nd century will be different from that in the 21st century, because many changes will take place.The population is growing fast. There will be more and more people in the world and most of them will live longer than before. Computers will be much smaller and more useful, and there will be at least one in every home. And computer studies will be one of the most important subjects at school.People will work fewer hours than they did in the 21st century, and they will have more free time for sports, watching TV and traveling. Traveling will be much easier. And more people will go to属于体外受精的动物是（　　） A、鸡B、鱼C、狗D、蚕