[1] Human beings are migrating to the virtual world．They spend too much time on the Internet and less and less time [2] participating in outdoor activities. Staying．indoors may do a lot of harm to US．[3] Firstly，if we always sit besides our desk facing the computer，we may get some [4] occupational diseases．And in the long run，they can lead to more serious problems to our body．[3] Secondly，we may lose many good opportunities to make friends if we do not have some [5] social interactions with others. [3] More seriously is that some people may easily become depressed and anxious，for isolation can be a great threat to our psychological health． In my opinion．outdoor activities can make our life more colorful． Therefore，we should [6] free ourselves from our demanding work and the Internet，and enjoy the outdoor time with our friends and relatives．Only by doing so can we [7] embrace a healthy body and mind．
Analysis
[1] Human beings are migrating to the virtual world．这句话是比喻 的说法，引出话题．说明人们花 在网上的时间之多。 [2] participate in outdoor activities： 参加户外活动 [3] Firstly…Secondly…More seriously is that：分条陈述观点， 让文章更有条理。 [4] occupational diseases：职业病。 [5] social interactions with others： 与他人的社交互动。 [6] free ourselves from…：把自己 从…中解放出来。 [7] embrace a healthy body and mind：拥有健康的身心。
第20题: [单项选择]治疗心室纤颤的最有效措施是 A. 吸氧 B. 气管内滴注肾上腺素 C. 静注利多卡因 D. 镇静 E. 电除颤 参考答案:E
