问题
单项选择题
食用不熟蛙肉使人体感染的裂头蚴属于（）
A、绦虫
B、线虫
C、吸虫
D、原虫
答案
参考答案：A
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食用不熟蛙肉使人体感染的裂头蚴属于（）
A、绦虫
B、线虫
C、吸虫
D、原虫
参考答案：A
Life in the twenty-first century will be very 50 . Many changes will take place, but 51 will the changes be. The population is growing 52 . There will be many 53 in the world and most of them will live 54 than people in the twentieth century. Computers will be much smaller and 55 and there will be at least one in every 56 . And 57 studies will be one of the important subjects in school then. People will work 58 and they will have more free time for sports, watching TV and travelling. 59 will be much easier and cheaper. And many more people will go to 60 countries for holidays. There will be changes in our 61 , too. Maybe no one will eat meat every day, instead, they eat more fruit and vegetables. Maybe people will be 62 . Work in the future will be different, too. 63 and hard work can be done by robots. Because of this, 64 will not have enough work to do .This will be a problem.
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