The sea can be very cold Divers who go deep down in the sea, know this. On the top the water may be warm. When the diver goes downwards, the sea becomes colder and colder. Another thing happens. When the diver goes deeper, the water above presses down on him. It squeezes him. Then the diver has to wear clothes made of metal. But he cannot go very deep. Some people who wanted to go very deep used a very strong diving ship! They went down to the deepest part of the sea in it. They went down to a depth of eleven kilometers!
练习:
1. When does the sea look beautiful?
A) When it is calm
B) When the weather is fine
C) When there is a strong wind
D) When there is a storm
2. How much of the earths surface does land cover?
A) 15%
B) 25%
C) 30%
D) 45%
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