Water is essential to living things.For instance,if there is no enough water in a human body,a person may feel uncomfortable or get sick easily.To make matters worse,one may die of thirst.Similarly,plants may wither or die for lackof water.It is apparent that all living things need water to keep alive. Judging from the importance of water,we should know how to conserve water.The first thing is to stop polluting water because what we really need is clean water.Atthe same time,besure to turn off the faucet immediately after using water.And we should make efficient use of water to avoid wasting it.One way is to recycle as much water as possible.To sum up,we should economize on water so as to maintain the abundance of water,which is an indispensable element of life
最新问答: 设矩阵 .求正交矩阵 使 为对角矩阵.(要求写出正交矩阵 和相应的对角矩阵 ) 已知二次函数y=(x+h)的平方+k的顶点为(1,-4) 一平板车,质量M=100kg,停在水平路面上,车身的平板离地面的高度h=1.25m,一质量m=50kg的物块置于车的平板 《江上婴儿》文言文答案17.解释下列句子中加点的词语.⑴见人方引婴儿而(欲)投之于江中( )⑵人问其(故)( )⑶(其 以感动为话题,写一篇作文. 濯灵 作文 生物柴油如何脱色?酸化油颜色很黑,在完成酯化反应以后,如何脱去颜色?这里是指添加什么试剂可以把颜色脱去?使用活性炭、白土 烛之武退秦师之以其用法 你有没有一篇关于启示的作文 a p w c o i t y h d m u y r t t l e e o a m o p 单词拼写六个 还要组成一 甲商品降价10%以后的价格与乙商品提价10%以后的价格相等,则甲的原价格是乙的原价格的() hurry out/off/up “欢迎来到召唤师峡谷”英文怎么说 函数y=-2x2+4|x|+1,求该函数的图象,定义域,值域,单调区间 当旭日驱散夜的残幕时,当夕阳被朦胧的地平线吞噬时,他不慌不忙地走着,光明和黑暗都无法改变他行进的节奏. 同分异构体的分子组成相同,分子结构不同是否正确 甲、乙两堆围棋都是白子和黑子,甲堆中白子与黑子的比是2:1,乙堆中白子与黑子的比是4:7.如果从乙堆中拿3颗黑子放入甲堆 诗句仿句月光淡淡,笼罩着村外的松林.白云团团,漏出了几点疏星.仿:小河( ), ( ).白鹅( ), ( ). 小学生用英语写一篇作文描写自己的老师叫附带中文 小明家5月份用电250千瓦时,其中用“峰电”150千瓦时,用谷电100千瓦时.请计算他们家使用峰电电价