问答题

In addition, many of the laborsaving devices of the modern lifestyle, such as personal computers, telephone extensions, and remote controls, promote a sedentary lifestyle.

【参考答案】

而且，现代生活方式中的许多省力的装置，比如个人电脑，延伸的电话，远程控制，都促进了久坐的生活方式。
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问答题
Meaningful studies on this topic are very difficult to perform because they require large populations of subjects and many years of data collection, and because poor health sometimes results in limitations to physical activity.
单项选择题
A．It is very well establishedB．It is relatively newC．It is found in one million homesD．It is being rapidly expanded
A．It is very well established
B．It is relatively new
C．It is found in one million homes
D．It is being rapidly expanded
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