問題詳情

IV. Reading Comprehension 15% Section A  In bogs, swamps, and sandy shores throughout the world, there exist unique species ofplant that prey upon unwary insects and other tiny animals. The ingenious methods thesecarnivorous plants employ are an evolutionary response to their natural habitat. Because thesoil found in swamps and marshlands is highly acidic and lacks vital ingredients necessary forplants to survive, these predators of the plant kingdom must augment their diets with a steadyintake of animal flesh. The myriad biomechanical means available to carnivorous plants makea fascinating study and also serve to demonstrate the incredible genius of Nature. 
 Each species of carnivorous plant relies on the same basic principle—lure the prey near itscentral portion where a trapping apparatus then activates and ensnares the unlucky target.Chemical breakdown of the prey follows, in an action quite similar to the digestion performedby animals, in which the prey is subjected to enzymatic agents or bacteria that process thetissues and then extract the various nitrogenous elements that are needed for consumption.When the process is complete, the trap is reset and made ready for the next victim. 
 The Venus’s-flytrap is perhaps the most well-known of all carnivorous plants for severalreasons, not the least of which is its fearsome outward appearance. The tips of the leaves extendoutward in two hinged lobes structured like gaping jaws, and a row of spiny protrusions lineseither side like teeth. When an insect alights upon the surface, miniscule hairs trigger thetrapping mechanism and the opening snaps shut. The teeth along the rim act as bars on a cage,preventing the victim from escaping. 
 Another clever meat-eater is the pitcher plant, native to both North and South America.This species has developed leaves that cup upwards, forming an urn-shaped container that iskept filled with water. The inner lip of the leaves is glazed with a fine patina of nectar. Insectsattracted to this glossy surface eventually fall prey to the smooth area just below the nectar.This zone is extremely slippery. It acts like a greasy slide, sending insects plummeting down tothe pool of water below, where they eventually drown.
36. What is the main point of the passage?
(A)Some plants eat animals and thus are dangerous to all forms of life.
(B) Environment has an important effect on plant evolution.
(C) Carnivorous plants are a unique species worthy of study.
(D)Swamps contain a variety of fascinating plant life.

參考答案

答案：C
難度：非常簡單1
統計：A(0),B(0),C(5),D(0),E(0)

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