The sea looks very beautiful when the sun is shining on it.It can be very terrible when there is a strong wind. The sea is very big.It covers three quarters of the earth.The sea is also very deep in som places.There is one place.The sea is about 1l kilometers deep there.The highest mountain i would still be 2 kilometers of water above it. In most parts of the sea,there are a lot of fishes an plants.Some live near the suface of the sea.Others live deep down.There are also a lot of small living things and lots of fish live by eating them.The sea can be very cold. When people go down,the sea becomes colder and colder.Only some men can go down into the deep sea.But,in 1970,five women scientists lived in the deep sea for fourteen days. 71.The sea is usually beautiful when it is____. A.silent B.windy C.sunny D.rainy 72.The sea covers_____of the earth. A.1/3 B.2/3 C.1/4 D.3/4 73.If we put the highest mountain in the world into the deepest parts of the sea,____. A.we can still see the sea water B.we can hardly see the sea water C.we can still see the top of the mountain D.there is still 2 kilometers of mountain above the sea 74.The underlined word”them”refers to A.fishes B.plants C.water D.small living things 75.Which of the following is RIGHT? A.The sea looks terrible when it is cloudy. B.The highest mountain in the world is about 11 kilometers height. C.Under the sea,the deeper,the colder. D.In 1970,five American scientists lived in the deep sea for 15 days.