Can we live without salt (没有盐)?No,salt is very important (重要) to us.We need salt in our food.
题目
Can we live without salt (没有盐)?No,salt is very important (重要) to us.We need salt in our food.
Animals (动物) need it,too.
Most (大部分) of the salt in our country comes from the sea (海).People dig (挖) great pools (池塘)
and let sea water in.When the sun dries up (使干枯) the water,people can get salt from the ground.The
salt is white,clean and beautiful.
There are a lot of salt wells (井) in Sichuan.A salt well is much like a water well.People bring the
well water up to the ground and then dry it in big jars over fire.In this way,they get salt.
We can also get salt mines.Some years ago people in JiangXi found (发现) a big salt mine and soon
opened it.people there no longer (不再) need salt from other places (地方).
In the northwest (西北) of our country,there are many salt lakes (盐湖).Some of these lakes are very
big.The
答案
举一反三
已知函数f(x)=x,g(x)=alnx,a∈R.若曲线y=f(x)与曲线y=g(x)相交,且在交点处有相同的切线,求a的值和该切线方程.
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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