A.Safe安全的；B. Easy容易的；C. Dangerous危险的。根据题意故选C

【题目】完型填空

Life in the twenty-first century will be very     .Many changes will take place(发生)，but________ will the changes be.

The population is growing  ________ .There will be many      in the world and most of them will live longer than people in the twentieth century.

Computers wil be much smaller and more useful, and there will be at least one in every ________  .And   ________ studies will be one of the important subjects in school then.

People will work fewer hours and they will have more free time for sports, watching Tv and travelling.   ________  will be much easier and cheaper. And many more people will go to   ________ countries for holidays.

There will be changes in our food, too. Maybe no one will eat meat every day, instead, they eat more fruit and vegetable. Maybe people will be healthier. Work in the future will be diffetent, too. ________and hard work can be done by robots(机器人). Because of this, ________  will not have enough work to do. This will be a problem.

【1】A interesting     B.hard                  C.different

【2】A.why             B. how                C. what

【3】A.slowly         B. fast                C. quietly

【4】A.people           B.workers               C.scientists

【5】A.hospital        B.factory              C.home

【6】A science         B.maths                C.computer

【7】A.Seeing doctors   B.Going to the cinema   C. Travelling

【8】A.rich            B. other                C. poor

【9】A.Safe            B. Easy                 C. Dangerous

【10】A.a few people   B. all the people      C. many people