题目

Harry potter and The Hunger Games haven’t been big hits for nothing．Lots of teens still read quite a lot．But a study shows a clear decrease over time．Nearly half of 17-year-olds say they read for pleasure no more than one or two times a year．That’s way down from ten years ago. The digital revolution (革命) means there are more platforms (平台) than ever to read on．Jim Steyer has been studying the effect of technology on children．He has four kids and has seen the trend most with his 16-year-old．“I start to see it in our 10-year-old as well, because he is reading less and先化简，再求值：，再从-1，0，1，2中选择一个合适的值代入求值.