(1)
A)Seventy-one percent.
B)Thirty percent.
C)Thirty-nine percent.
D)Twenty-nine percent. (2)
A)Shadow.
B)Deep.
C)Shallow.
D)Regular. (3)
A)The deep water area of the sea.
B)The end of the flat area.
C)The shallow water area near the continents.
D)Any place on the sea floor.
原文：
Passage 1
The sea is the largest unknown part of our world. It covers seventy-one
percent of the earth. There is still much to be discovered about this vast
blanket of water.
If the waters of the ocean could be moved away, the sea floor with its
wide valleys, irregular fountains and rivers in the sea would be an
unbelievable sight. Around the edges of the continents the ocean floor is
flat and the water does not become much deeper for about thirty miles.
Where there are high young mountains along the coast, this flat part may
be much less than thirty miles. But where rivers flow into the sea, the
flat area may extend for hundreds of miles.
The region near the continents, where the water is not so deep, is the
place where you can find a lot of living creatures and plants. Below these
living creatures and plants are the largest known quantities of minerals.
At the end of the flat part the sea floor suddenly drops down, forming
deep hollows which are shaped like bowls. These huge hollows hold most of
the world's water.
Questions 11 to 13 are based on the passage you have just heard.
11. How much percent of the earth does the sea cover?
12. How is the water around the edges of the continents?
13. Where is the good place for living creatures in the sea?