完形填空 先通读下面的短文，掌握其大意，然后在每小题所给的四个选项中，选出可以填入空白处的最佳选项。（本大题共10分，每小题1分） Life in the 22nd century will be different from life in the 21th century，because many changes will take place in the new century. But what will the changes be? The population(人口) is fast．There will be more and more people in the world and most of them will live than before． 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 important subjects at． People will work fewer hours than they did in the 21th century，and they will have more free time for sports， TV and traveling．Traveling will be more .And many more people will go to other countries for holidays． More land will be used for building new towns and houses．Then there will be less room for cows and sheep，so will be more expensive．Maybe no one will eat it every day，they eat more vegetables and fruit．Maybe people will be healthier． Work in the future will be，too．Dangerous and hard work will be done by robots(机器人)． of this，many people will not have enough work to do．This will be a problem．