問題詳情

53 至 56 題為題組Many marine animals, including penguins and marine iguanas, have evolved ways to get rid of excesssalt by using special salt-expelling glands around their tongue. However, the sea snake’s salt glands cannothandle the massive amounts of salt that would enter their bodies if they actually drank seawater. This posesa serious problem when it comes to getting enough water to drink. If seawater is not an option, how doesthis animal survive in the ocean?An international team of researchers focused on a population of yellow-bellied sea snakes living nearCosta Rica, where rain often does not fall for up to seven months out of the year. Because yellow-belliedsea snakes usually spend all of their time far from land, rain is the animals’ only source of fresh water.When it rains, a thin layer of fresh water forms on top of the ocean, providing the snakes with a fleetingopportunity to lap up that precious resource. But during the dry season when there is no rain, snakespresumably have nothing to drink. Thus, the team became interested in testing whether sea snakes becamedehydrated at sea.第 7 頁 105年學測共 7 頁 英文考科- 7 -The researchers collected more than 500 yellow-bellied sea snakes and weighed them. They found thatduring the dry season about half of the snakes accepted fresh water offered to them, while nearly none didduring the wet season. A snake’s likelihood to drink also correlated with its body condition, with morewithered snakes being more likely to drink, and to drink more. Finally, as predicted, snakes captured duringthe dry season contained significantly less body water than those scooped up in the rainy season. Thus, itseems the snake is able to endure certain degrees of dehydration in between rains. Scientists believe thatdehydration at sea may explain the declining populations of sea snakes in some parts of the world.
53. What is the purpose of the study described in this passage?
(A) To test if sea snakes lose body water at sea.
(B) To see whether sea snakes drink water offered to them.
(C) To find out if sea snakes are greatly reduced in population.
(D) To prove that sea snakes drink only water coming from rivers.

參考答案

答案：A
難度：困難0.353591
統計：A(64),B(58),C(33),D(18),E(0)

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