TPO69阅读真题+题目+答案下载：Why Snakes Have Forked Tongues

TPO69阅读真题+题目+答案下载：Why Snakes Have Forked Tongues

1.The forked tongue of snakes has intrigued people for millennia, inspiring many hypotheses. In many cultures and religions, the forked tongue symbolizes malevolence and deceit. The first person known to inquire about the functional significance of the forked tongue was Aristotle; he suggested that it would double the pleasure of sensations of taste. By the beginning of the twentieth century, the consensus was that the snake's tongue is a tactile organ; that is, the snake uses it to tap the ground much as a blind person uses a cane .

2.In 1920 Browman suggested what seemed to be a winning hypothesis: When the snake retracts its tongue, the tips (or tines) of the forked tongue are inserted into openings on both sides of the roof of the mouth; through these openings chemical stimuli reach special organs that help snakes detect smells- -the vomeronasal organs (VNO). These organs are highly developed in snakes, lizards, and many mammals. They are a second system for detecting smells that appears to have evolved specifically to detect pheromones, the chemical signals that animals secrete as messages to other animals of their species.Browman suggested that the forked tongue flicks out. picking up chemical signals, and then delivers these to the VNO. This hypothesis was widely accepted into the 1980s. Then X-ray 。。。。余下TPO69阅读真题-Why Snakes Have Forked Tongues原文省略！

1.The word "secrete" in the passage is closest in meaning to

1.hide

B.intend

C.produce

D.collect

2.According to paragraph 2,what was discovered as a result of X-ray movie studies of snakes and lizards?

A.The two tines of the forked tongue flick out to pick up chemical signals

B.VNO are highly developed in snakes and lizards.

C.Snakes and lizards cannot accurately detect the pheromones of animals of other species

D.The snake's tongue deposits chemical molecules on pads at the bottom of the snake's mouth.

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