题目内容
完形填空
Nearly 70 percent of the surface of the earth is covered by water, 1 the land we live 2 is rather 3 , only about 30 percent of the earth's surf ace.
The ocean water is 4 . The proportion of salt to water is one to twenty－nine.
In some of the 5 the proportion is larger. The Mediterranean is in the place 6 the weather is very hot. The sea loses, 7 water 8 the air but the salt 9 . The Mediterranean contains 37 to 39 parts of salt per thousand parts of water. 10 , the saltiest lake in the world is the Great Salt Lake in the USA. And the most 11 salt lake is the Dead Sea, in the Middle East.
How does the sea water 12 clean? The Sea － weeds 13 an important part in it. Various chemicals 14 by them can 15 the sea water clean.
Coral is very beautiful. But it only lives in the sea where the water is 16 . The depth of water should be 17 than 60 metres. Coral is not a plant. It is formed 18 the bones of very small sea animals. The 19 coral bed in the world is near the north － east coast of 20 . It is 2010 kilometres long.
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解析：
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