题目内容：
根据以下材料，回答题Passage 1
Oceans cover nearly 75% of the earth's surface.Based on the amount of light received, the ocean can be divided from its surface to its depth into three zones. Sunlit zone is the top layer, which goes down about 600 feet. There is rich light going through the water for photosynthesis to occur here. More than 90% of all marine
life lives in the sunlit zone.
Twilight zone begins at about 600 feet under the water and extends to the darkest part, which begins about 3,000 feet down. Only a small amount of light can reach the water at this depth. As the water becomes deeper, the water pressure increases, too. Plants do not grow here. Some animals that live in the twilight zone can use their bodies to make light.90%of the ocean is in the midnight zone. It is entirely dark--there is no light.The water pressure is extreme. The temperature is near freezing. What can live in the midnight zone?The living things found here live close to cracks in the earth's crust. These cracks give off mineral-rich mate-rials from the earth itself. Special forms of bacteria use these materials from the cracks for energy to make food. All other living things are nourished by these bacteria.
Living things in oceans have always been an important and reliable source of food.Ocean fishing ac-counts for 80% of the world fish catch. However, overuse of the ocean by m s led to the decline in popu-lation of some fish. Therefore,over fishing should be studied as a real problem in future scientific exploration.
( ) According to the passage, three zones of the ocean have the following differences EXCEPT A．the pressure of water
B．the depth of water
C．the influence of fishing
D．the amount of light
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