题目内容
11．The ocean can be divided into three zones based on the amount of light each receives（受光面）.1．The Sunlit Zone．This is th op layer，nearest the surface，with enough light entering the water to support photosynthesis（光合作用）．The sunlit zone goes down about 600 feet．Because photosynthesis occurs here，more than 90 percent of all marine life lives in it，including most fish.2．The Twilight Zone （昏暗带）．Only a small amount of light gets through the water to reach this zone．As the water becomes deeper，the pressure increases．Plants do not grow here； only animals that have adapted to having little light survive．These include lantern fish and mid-water jellyfish （水母）．This part of the ocean extends（延伸）from about 600 feet to about 3，000 feet under the water Some of the fish that live here have adapted to being able to make light them-selves.3．The Midnight Zone．Ninety percent of the ocean is in this zone，which is completely dark，and under extreme water pressure．The temperature is near freezing．What can live in the midnight zone？The living things found here live close to cracks（板块间隙）in the earth's crust （地壳）．These cracks release（释放） mineral-rich materials from the interior of the earth itself．Special kinds of bacteria（细菌）live here，and all other things living in the midnight zone feed on these bacteria．1．Why does most marine life live in the sunlit zone？C
A．Because the water pressure is extreme there．
B．Because this zone has many kinds of fish．
C．Because photosynthesis takes place in this zone．
D．Because this zone is rich in minerals．
2．The twilight zone extends aboutD feet．
A.600 B.3，000 C.3，600 D.2，400
3．Which of the following would be the best title for the text？A
A．Light Zones in the Ocean
B．Living Things in the Ocean
C．The Depths of the Ocean
D．How Fish urvive in the Ocean．
分析 本文讲述的是光的分布对海洋内生物分布的影响．
解答 1--3 CDA
1．C 考查细节理解．根据"1．The Sunlit Zone．This is th op layer，nearest the surface，with enough light entering the water to support photosynthesis（光合作用）．The sunlit zone goes down about 600 feet．Because photosynthesis occurs here，more than 90 percent of all marine life lives in it，including most fish"可知，因为光合作用发生在这个区域，所以大多数海洋生物都生活在阳光普照的区域．故选C．
2．D 考查细节理解．根据"This part of the ocean extends（延伸）from about 600 feet to about 3，000 feet under the water Some of the fish that live here have adapted to being able to make light them-selves"可知，该区域的数量是3000-600=2400．故选D．
3．A 考查文章主旨．根据文章内容可知，本文介绍的是海洋中的光区．故选A．
点评 阅读理解考察学生的细节理解和推理判断能力，做细节理解题时一定要找到文章中的原句，和题干进行比较，再做出正确的选择．在做推理判断题不要以个人的主观想象代替文章的事实，要根据文章事实进行合乎逻辑的推理判断．
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