Salt is very important to us．①Without(没有)enough salt, we will get ill．Animals need salt, too．They need salt to grow strong．Most of salt comes from the sea．People dig(挖) very big pools and let sea water in．When the sun dries up the water, people can get the salt from the ground．②There are a lot of salt wells(井)in our country．People bring the well water up to the ground and then dry it up in big jars(罐子)over fire．In this way, we can get salt．We can also get salt from salt mines(矿)．The salt mines are under the ground．A few years ago, ③ China, salt, big, found , a , mine, in, people．In the northwest of China, there are a great number of salt lakes．Some of them are very big． The salt in these lakes will be enough for all the people in our country for as long as hundreds of years．
把①改为同义句。 If we ________  _________ enough salt, we will get ill．
把②句译成汉语.
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把③句排列成一句正确的句子.
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根据短文内容完成句子。
We can get salt from the sea, salt wells, salt mines and  ________________．
Where are a great number of salt lakes ?(回答问题)