酸甜苦辣咸的作文500字任选一种【一】
Long, long ago, there were two brothers, the one rich and the other poor. When Christmas Eve came, the poor one had not a bite in the house, either of meat or bread; so he went to his brother, and begged him, in God's name, to give him something for Christmas Day. It was by no means the first time that the brother had been forced to give something to him, and he was not better pleased at being asked now than he generally was.
"If you will do what I ask you, you shall have a whole ham," said he. The poor one immediately thanked him, and promised this.
"Well, here is the ham, and now you must go straight to Dead Man's Hall," said the rich brother, throwing the ham to him.
"Well, I will do what I have promised," said the other, and he took the ham and set off. He went on and on for the livelong day, and at nightfall he came to a place where there was a bright light.
"I have no doubt this is the place," thought the man with the ham.
An old man with a long white beard was standing in the outhouse, chopping Yule logs.
"Good-evening," said the man with the ham.
"Good-evening to you. Where are you going at this late hour?" said the man.
"I am going to Dead Man's Hall, if only I am on the right track," answered the poor man.
"Oh! yes, you are right enough, for it is here," said the old man. "When you get inside they will all want to buy your ham, for they don't get much meat to eat there; but you must not sell it unless you can get the hand-mill which stands behind the door for it. When you come out again I will teach you how to stop the hand-mill, which is useful for almost everything."
So the man with the ham thanked the other for his good advice, and rapped at the door.
酸甜苦辣咸的作文500字任选一种【二】
如果盐类元素不断地输入海洋，那海水不是会变得越来越咸了吗？还好在海洋中的生物会吸收许多的盐类物质，而化学吸附与沉淀作用也会将部分海水中的盐类转入沉淀物形态。根据测试研究发现，海水并没有越来越咸，海水中的盐份并没有在增加。
为什么湖水不是咸的呢？因为蒸气到了空气中的\'水份在经由雪，雨以及地下水形成汇集至湖中,写人作文，就成了湖水，而湖水的盐份是海水的几百分之一，所以，我们感觉不到咸味。但是如沙漠里的湖，湖水不断地被蒸发，那么湖水也会像海水一样咸。横跨约旦和以色列的海，就是闻名于世的咸水湖。
海水中的水估计只有96.5%,其它的3.5%是氯化钾，氯化镁等盐类，根据实验平均有35克盐溶解在每千克海水中，其中氯化钾（盐类）占的比重较大，因为存在大量的氯化钾，所以海水才是咸的。
我国沿海城市居民，早期引进海水用日晒的方法提取海盐食用，这证明了海水中含有盐份，海水是咸的。我们可以用一个1250CC的瓶子装满海水，加热蒸发后大概可以得到一汤匙的食盐，所以，这也可以证明海水里含有盐份。
这样，海水是咸的道理我们都明白了吧。
