The world is not only hungry,but it is also thirsty for water. About 97%of water on the earth is sea water,or salty water. Man can only drink or use the other 3 % of the fresh water 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 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. There is one place near Japan. It's nearly 11 kilometres deep. The highest mountain in the world is about 9 kilo?metres high. If we put that mountain into the sea at that place,there would be 2 kilometres of water above it!The sea is salty. There is one "sea" called the Dead Sea. 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 kilometres long,between 4. 8 and 17. 7 kilometres wide. 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.

(   ) 1. Does the fresh water come from rivers,lakes and underground?

   A. Yes,it does.

   B. No,it doesn't.

   C. Yes,it doesn't.

   D. No,it does.

(   ) 2. The deepest place in the sea is near .

   A. Japan   B. India

   C. America   D. China

(   ) 3. The Dead Sea is about .

   A. 80 kilometres long

   B. 2 kilometres wide

   C. 11 kilometres deep

   D.17. 7 kilometres high

(   ) 4. According to the passage,which of the following isn't true?

   A. The river Jordan runs into the Dead Sea.

   B. The world will be thirsty for water.

   C. The sea looks beautiful when the sun is shining on it.

   D. The Dead Sea is the saltiest sea in the world.

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