3．
根据短文内容，选择正确答案。
Can we live
without salt? No, salt is very important to us. We need salt in our food.
Animals need it, too. Most of the salt in our country comes from the sea.
People dig very big pools and let sea water in. When the sun dries up 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 from salt mines（矿）. A salt mine may be found under the ground. Some years ago, people
in Jiangxi found a big salt mine and soon opened it. People there don't need
salt from other places any more.
In the north-west
of our country, there are many salt lakes. Some of these lakes are very big.
The salt even in one big lake will be enough for our people for centuries.
