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TOEFL全真试题
Reading Comprehension
Time: 55 minutes(including the reading of the directions).Now set your clock for 55 minutes.Question 1-12
Orchids are unique in having the most highly developed of all blooms, in which the usual male and female reproductive organs are fused in a single structure called the column.The column is designed so that a single pollination will fertilize hundreds of thousands, and in some
cases millions, of seeds, so microscopic and light they are easily carried by the breeze.Surrounding the column are three sepals and three petals, sometimes easily recognizable as such, often distorted into gorgeous, weird, but always functional shapes.The most noticeable of the
petals is called the labellum, or lip.It is often dramatically marked as an unmistakable landing
strip to attract the specific insect the orchid has chosen as its pollinator.To lure their pollinators from afar, orchids use appropriately intriguing shapes, colors, and scents.At least 50 different aromatic compounds have been analyzed in the orchid family, each blended to attract one, or at most a few, species of insects or birds.Some orchids even change their scents to interest different insects at different times.Once the right insect has been attracted, some orchids present all sorts of one-way obstacle
courses to make sure it does not leave until pollen has been accurately placed or removed.By such ingenious adaptations to specific pollinators, orchids have avoided the hazards of rampant
crobreeding in the wild, auring the survival of species as discrete identities.At the same time
they have made themselves irresistible to collectors.1.What does the paage mainly discu?
(A)Birds
(B)Insects
(C)Flowers
(D)PerfumeThe orchid is unique because of
(A)the habitat in which it lives
(B)the structure of its bloom
(C)the variety of products that can be made from it
(D)the length of its lifeThe word “fused” in line 2 is closest in meaning to
(A)combined
(B)hidden
(C)fertilized
(D)producedHow many orchid seeds are typically pollinated at one time?
(A)200
(B)2,000
(C)20,000
(D)200,000Which of the following is a kind of petal?
(A)The column
(B)The sepal
(C)The stem
(D)The labellumThe labellum(line7)is most comparable to
(A)a microscope
(B)an obstacle course
(C)an airport runway
(D)a racetrackThe word “lure” in line 10 is closest in meaning to
(A)attract
(B)recognize
(C)follow
(D)helpWhich of the following is NOT mentioned as a means by which an orchid attracts insects?
(A)Size
(B)Shape
(C)Color
(D)PerfumeThe word “their” in line 13 refers to
(A)orchids
(B)birds
(C)insects
(D)speciesWhich of the following statements about orchids scents does the paage support?
(A)They are effective only when an insect is near the bloom.(B)Harmful insects are repelled by them.(C)They are difficult to tell apart.(D)They may change at different times.The word “placed” in line 15 is closest in meaning to
(A)estimated
(B)measured
(C)deposited
(D)identifiedThe word “discrete” in line 18 is closest in meaning to
(A)complicated
(B)separate
(C)inoffensive
(D)functional
