阅读理解

　　The world is not only hungry, it will also be thirsty for water．About 97％ of water on the earth is sea water, or salty(咸的)water．Man can only drink or use the other 3％ of the fresh water(淡水)which comes from rivers, lakes and underground．

　　The sea is very big．Look at the map of the world．There is more sea than land．It covers(覆盖)three quarters of the earth．It looks very beautiful when the sun is shining on it．But it can be terrible when there is a strong wind．

　　Some parts of the sea are very deep(深)．There is one place near Japan．It's nearly 11 kilometers deep．The highest mountain in the world is about 9 kilometers high．If we put that mountain into the sea at that place, there would be 2 kilometers of water above it!

　　The sea is salty．There is one“sea”called the Dead Sea(死海)．The Dead Sea is not a sea．It's a big lake in the Jordan Valley．It's the saltiest．It's near the city of Jericho．It's about 80 kilometers long, between 4.8 and 17.7 kilometers wide(宽)．The river Jordan runs into the Dead Sea．The sun is hot there and the water is salty．Fish can't live in the Dead Sea and plants can't grow near it．People can't swim well in the Dead Sea, but they can float(漂浮)on the water．The water is very blue and the air is clean．In winter people come to the Dead Sea to enjoy the sunshine．

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阅读理解

　　Skin-diving isa new sport today．Thissport takesyou into a wonderful new world! It islike a visit to the moon! When you are under water, it'sea sy for you to climb big rock s, because you are no longer heavy．

　　Here, under water, everything isblue and green, during the day, there isenough light．When fish swim nearby, you can catch them with your hand s．

　　When you have tank s(箱; 罐)of air on your back, you can stay in deep water for a long time．But you mu st be careful when you dive(潜水)in deep water．

　　To catch fish isone of the most intere sting partsof thissport．Be side s(并且), there are many usesof skin-diving．You can clean shipswithout taking them out of water．You can get many thingsfrom the deepsea．

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阅读理解，阅读下列短文，从每题所给的四个选项(A、B、C、D)中，选出最佳选项。

　　Did you know that a turtle(乌龟)can lay 12 eggs in one minute? A large sea turtle lays around 150 eggs at a time．She lays all these eggs in just a few minutes．

　　Large sea turtles live in the warm seas of the world．Except for when they lay their eggs, they spend their whole lives in the water．When it is time to lay their eggs, the females swim to land．

　　They usually return to the place where they themselves were born．How they find their way back there is unknown．

　　When they reach shore, the big, heavy turtles crawl slowly up to the high water mark．Using their flippers, they pull themselves along the sand．They must struggle like mountain climbers．When they finally reach dry sand, they rest before beginning the difficult task of laying eggs．

　　The turtles lay the eggs in deep holes and cover them with warm sand．The sand protects the eggs from harm．Then the females leave them．After a few weeks, if you happened to be walking along the beach, you might see the sand begin to shake．You may see tiny black balls coming out of the sand．The tiny heads of baby turtles!

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