What covers three﹣fourths of the Earth's surface？ It's the water that makes up the Earth's four oceans．They are the Pacific，the Atlantic，the Indian and the Arctic．The Pacific Ocean is the largest and deepest． The Arctic is the smallest and shallowest．

Stand on a beach and watch the ocean． You will see that it is never still （平静的）． The ocean is in constantmotion （运动）． Wind blows across the surface of the water． This makes waves． Ocean waves are different in height． A light wind causes small waves． In a hurricane （飓风）， winds can cause huge， dangerous waves that can get to be more than 14 meters high!

Ocean currents （洋流） are lots of water that move from seaside to seaside． Like waves，currents are caused by wind． Ocean currents can be warm or cold． In areas close to land， warm ocean currents make the air warmer； cold ocean currents make it colder．

At high tide （涨潮时期）， the ocean covers much of the beach． At low tide， you can walk on the sand that had earlier been covered by ocean water． Tides are caused by the pull of gravity （重力）as the moon circles the Earth．

The ocean provides people with many resources． Ocean water has salt﹣a basic cooking material． Ocean fishing provides work and food for many people． The ocean is also a fun place to visit． Children who live near the ocean often like to swim in the waves，hunt for shells and play in the sand．

The ocean may look like a large pool of water， but it's much more than that．

（1）What is mainly talked about in the first paragraph？ 　　

A．	Four oceans cover three﹣fourths of the Earth's surface．
B．	The Earth's surface is wet．
C．	The Pacific Ocean is the largest ocean．
D．	The Arctic Ocean is the smallest ocean．

（2）The underlined word "constant" in the second paragraph probably means 　　in Chinese．

A．	奇怪的
B．	连续的
C．	不规则的
D．	危险的

（3）Which of the following statements is TRUE according to the passage？ 　　

A．	It is always colder near the ocean．
B．	Everyone who lives near the ocean loves to swim．
C．	The Arctic Ocean is bigger than the Atlantic Ocean．
D．	Oceans provide many of the things that people need．

（4）Which of the following can be the best title for the passage？ 　　

A．	Ocean Fishing．
B．	What Makes Oceans Move．
C．	Ocean on the Move．
D．	How Oceans Formed．

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