11．錄音中有一篇短文，聽短文兩遍，然后從每小題A、B、C中選出能回答每個問題的正確答案．
16．How does the sea look when the sun is shining？
A．Dangerous． B．Beautiful． C．Very wide．
17．How many quarters of the world is sea？
A．One quarter． B．Two quarters． C．Three quarters．
18．How high is the highest mountain in the world？
A．About 9 kilometers． B．About 11 kilometers． C．Several kilometers．
19．What is the temperature of the deep sea water？
A．Cool． B．Warm． C．Cold．
20．What can you see in most places of the sea？
A．Fish and animals． B．Nothing． C．Fish and plants．
