问题
单项选择题
( )能够控制调查对象，应用灵活，调查信息充分；但是调查周期长、费用高，存在调查人员效应，调查对象容易受调查的心理暗示影响。
A．文案调查
B．实地调查
C．问卷调查
D．实验调查
答案
参考答案：B
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( )能够控制调查对象，应用灵活，调查信息充分；但是调查周期长、费用高，存在调查人员效应，调查对象容易受调查的心理暗示影响。
A．文案调查
B．实地调查
C．问卷调查
D．实验调查
参考答案：B
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| Life in 30 years will be 1 because many changes will take place, but what will the changes be? The population is growing fast. There will be 2 people in the world and most of them will live longer than before. Computers will be 3 smaller and more useful, and there will be at least one in every home. And computer studies will be one of the important 4 in school. People will work fewer hours than they are doing now, and they will have more free time for sports, watching TV and traveling. Traveling will be much cheaper and 5 . And many more people will go to other countries 6 holidays. There will be changes in our food, too. More land will be used for 7 new towns and houses. Then there will be less 8 for cows and sheep, so meat will be more expensive. Maybe people won't eat it every day, they will eat more vegetables and fruit instead. Maybe people will be healthier. Work in the future will be different, too. Dangerous and hard work will 9 by robots. Because of this, many people will not have 10 to do. This will be a problem. | ||||
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