As we know,nearsightedness is a troublesome thing in our daily lives.Many thing may cause nearsightedness.For example,reading in the sun for a long time may hurt our eyes and even cause nearsightedness.How to protect your eyesight?It's important for everyone to keep good eyesight.But do you know how to protect your eyesight?First,don't keep your eyes working for a long time.You'd better have a rest by looking in the long distance after you have studied an hour or so.Second,pay attention to the following:Don't read in the sun or in a poor light; don't read in bed or in a moving bus.And when you read you should keep the book away from your eyes for about a foot.And third,do eye-exercises every day.It will also help you keep good eyesight.If you obey the rules above,I think,you may prevent your eyesight from becoming short-sighted.
最新问答： 听短文，补单词 Is this your (1)__________? 若(sinα +cosα)²=3^x+3^（-x）,α∈（0,π/2) ,则tanα=______ 定积分 积分符号上2下1*lnxdx和 积分符号上2下1*lnx的平方dx 比大小 英汉互译1.be careful————2.plant tree————3.give a seat to someone 10个点最多可以连成几条线段 1到25的序数词 3根号15sinx+3根号5cosx 饮水思源的同义词都有哪些? 物理密度可以加减密度吗 读史使人明智,读诗使人灵秀,数学使人周密,科学使人深刻,伦理学使人庄重,逻辑修辞之学使人善辩.仿写 the Browns 是单数还是复数呀? 求二元函数0比0型求极限任意例题一道 CH3COOH是酸吗?CO、SO3是酸性氧化物吗?液氧是纯净物还是混合物？ “龟兔赛跑”讲述了这样的故事：领先的兔子看着缓慢爬行的乌龟，骄傲起来，睡了一觉，当它醒来时，发现乌龟快到了终点了．于是急 It is a wonderful place to live还是It is a wonderful place to 9.设 [x]表示不大于x得最大整数, 如[3 ,4 ]= 3 ,[2 ] = 2 ,则[ 10^2009 / 10^4 晶体脱水属于什么变化 【高一物理】一道求摩擦力的题目》》 为什么会有毒蘑菇很容易吃醋哦 若△ABC的三边a.b.c满足a²+b²+c²+338=10a+24b+26c,是判断△ABC的形状.
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