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 (昏暗帶).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(板塊間隙)in the earth's crust (地殼).These cracks release(釋放) mineral-rich materials from the interior of the earth itself.Special kinds of bacteria(細菌)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 本文講述的是光的分布對海洋內生物分布的影響.
解答 1--3 CDA
1.C 考查細節(jié)理解.根據(jù)"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,因為光合作用發(fā)生在這個區(qū)域,所以大多數(shù)海洋生物都生活在陽光普照的區(qū)域.故選C.
2.D 考查細節(jié)理解.根據(jù)"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,該區(qū)域的數(shù)量是3000-600=2400.故選D.
3.A 考查文章主旨.根據(jù)文章內容可知,本文介紹的是海洋中的光區(qū).故選A.
點評 閱讀理解考察學生的細節(jié)理解和推理判斷能力,做細節(jié)理解題時一定要找到文章中的原句,和題干進行比較,再做出正確的選擇.在做推理判斷題不要以個人的主觀想象代替文章的事實,要根據(jù)文章事實進行合乎邏輯的推理判斷.