现在测视力时一般使用《标准对数视力表》，其记录方法是采用国际上常用的5分记录和小数记录两种。视力达到5.0（也就是小数记录为1.0）为正常。下面是近几年小学生升初中体检中新生视力统计表（视力底于5.0的学生人数占整个受检查人数的百分率）。
（1）作出比率扇形比例图。
（2）根据柱状图和你自己的切身体会，分析一下为什么1999年以后近视眼的发病率较高？
（1）
（2）因为1999年以后学生的学习压力大，对眼的保护不够，导致视力急剧减退。
A. the digital atomic watch B. the dolphin wood kit C. the Russian nesting dolls 小题2:If you know how to make up the dolphin wood kit, you need to help you to finish it. A. nothing B. glue C. some tools 小题3:If you use a digital atomic watch, you should buy a battery . A. every half year B. every year C. every two years 小题4:Maria wants to buy two sets of the nesting dolls and two dolphin wood kits, she should pay . A. $ 65 B. $ 66 C. $ 23 小题5:From the ads we know that . A. you can’t wear the digital atomic watch when you go surfing B. if you don’t know how to make up the dolphin wood kit, you can follow the instruction C. the painting of the Russian nesting dolls are made by machines. |
