黑色海洋
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Looking at the map of the world, (去掉and) you can see that three (quarter改成quarters) of the earth is covered by water. (Therefore改成However), we are short of water, it sounds strange to you. But it is true. You see, 97% of the total water in the world (are改成is) sea water, which is so (salt改成salty) that man can't drink it. So only 3% of the water can be drunk or used (for改成by) man. And the drinkable water comes from rivers, lakes and underground. Man even can't use (them改成it) completely, because the water (contains改成includes) icebergs and glaciers. All (what改成that) is the worst is that water in some parts has been polluted or is being polluted. How can we drink (加入it)? So something must be done to prevent water from being polluted.
1年前
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