成上人色爱视频

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                大學英語四級題庫/閱讀理解 Section C

                    Coincident with concerns about the accelerating loss of species and habitats has been a growing appreciation of the importance of biological diversity, the number of species in a particular ecosystem( 生態系統., to the health of the Earth and human well-being. Much has been written about the diversity of terrestrial organisms ( 陸生生物., particularly the exceptionally rich life associated with tropical rain-forest habitats. Relatively little has been said, however, about diversity of life in the sea even though coral reef.systems are comparable to rain forests in terms of richness of life. 
                    An alien exploring Earth would probably give priority to the planet's dominant, most distinctive feature-the ocean. Humans have a bias toward land that sometimes gets in the way of truly examining global issues. Seen from far away, it is easy to realize that land masses occupy only one-third of the Earth's surface. Given that two-thirds of the Earth's surface is water and that marine life lives at all levels of the ocean, the total three-dimensional living space of the ocean is perhaps 100 times greater than that of land and contains more than 90 percent of all life on Earth even though the ocean has fewer distinct species. 
                    The fact that half of the known species are thought to inhabit the world's rain forests does not seem surprising,considering the huge numbers of insects that comprise the bulk of the species. One scientist found many different species of ants in just one tree from a rain forest. While every species is different from every other species, the genetic makeup constrains them to be insects and to share similar characteristics with 750,000 species of insects. If basic, broad categories such as phyla( 門. and classes( 綱. are given more emphasis than differentiating between species, then the greatest diversity of life is unquestionably in the sea. Nearly every major type of plant and animal has some representation there. 
                    To appreciate fully the diversity and abundance of life in the sea, it helps to think small. Every spoonful of ocean water contains life, on the order of 100 to 100,000 bacterial cells plus assorted microscopic (極小的. plant sand animals, including larvae( 幼蟲. of organisms ranging from sponges and corals to starfish and clams( 蛤蜊.and much more. 

                1.[單選題]Why does the author compare rain forests with coral reefs?
                • A.They are approximately the same size.
                • B.They share many similar species.
                • C.Most of their inhabitants require water.
                • D.Both have many different forms of life.
                2.[單選題]The passage suggests that most rain forest species are
                • A.insects
                • B.bacteria
                • C.mammals
                • D.birds
                3.[單選題]Which of the following conclusions can be drawn from the passage?
                • A.Ocean life is highly adaptive.
                • B.Ocean life is primarily composed of plants.
                • C.The sea is highly resistant to the damage caused by pollutants.
                • D.More attention needs to be paid to preserving ocean species and habitats.
                4.[單選題] The main point of the passage is that
                • A.humans are destroying thousands of species
                • B.there are thousands of insect species
                • C.the sea is even richer in life than the land
                • D.coral reefs are similar to rain forests
                5.[單選題]The author argues that there is more diversity of life in the sea than in the rain forests because
                • A.there are too many insects to make meaningful distinctions
                • B.more phyla and classes of life are represented in the sea
                • C.many insect species are too small to be divided into categories
                • D.marine life forms reproduce at a faster rate
                參考答案: D,A,D,C,B