特殊教育
114年
英文
第 21 題
📖 題組：
On the island of Guam in the western Pacific Ocean, a party was interrupted by an uninvited guest: a brown form curled around the remaining roast pig, swallowing the pig’s flesh whole. The visitor was a brown tree snake, an alien invader which is thought to have been accidentally introduced to Guam in the 1940s, perhaps after sneaking onto a cargo ship. Before this, an abundance of native birds had enjoyed their life in the island’s otherworldly forests. But within just four decades of the snake’s invasion, these predators had begun emptying the jungle of every single one. Out of 12 species, ten are now extinct on the island. Without birds to disperse seeds, trees are dying out, and the ecosystem is changing. What’s scarier is that an evolutionary experiment is unfolding. On most of the Mariana Islands in the Pacific Ocean, there are relatively few spiders in the rainy season, with a large increase in number as the climate dries out. But not on Guam. There is a near-continuous tangle of silvery threads of webs that stretches for miles, going from ground level all the way up to the treetops, all year round. To find out how many spiders had taken over Guam, some scientists set about doing surveys in the island’s forests. The scientists found that during the wet season, there were 40 times more spiders in Guam’s forests than on the nearby islands of Rota, Tinian, and Saipan. Since Rota, Tinian, and Saipan are free of brown tree snakes and still have healthy bird populations, the study suggests that Guam’s spider population may once have been unremarkable, before the absence of birds. And it fits with research conducted in the Bahamas, which has found that spiders are about 10 times more abundant on islands where there are no lizards—their natural enemy. Though conservationists and wildlife officials have used every conceivable method, like using viruses as bioweapons or toxic poisons, to eliminate the brown tree snakes from Guam, the invaders are winning.
On the island of Guam in the western Pacific Ocean, a party was interrupted by an uninvited guest: a brown form curled around the remaining roast pig, swallowing the pig’s flesh whole. The visitor was a brown tree snake, an alien invader which is thought to have been accidentally introduced to Guam in the 1940s, perhaps after sneaking onto a cargo ship. Before this, an abundance of native birds had enjoyed their life in the island’s otherworldly forests. But within just four decades of the snake’s invasion, these predators had begun emptying the jungle of every single one. Out of 12 species, ten are now extinct on the island. Without birds to disperse seeds, trees are dying out, and the ecosystem is changing. What’s scarier is that an evolutionary experiment is unfolding. On most of the Mariana Islands in the Pacific Ocean, there are relatively few spiders in the rainy season, with a large increase in number as the climate dries out. But not on Guam. There is a near-continuous tangle of silvery threads of webs that stretches for miles, going from ground level all the way up to the treetops, all year round. To find out how many spiders had taken over Guam, some scientists set about doing surveys in the island’s forests. The scientists found that during the wet season, there were 40 times more spiders in Guam’s forests than on the nearby islands of Rota, Tinian, and Saipan. Since Rota, Tinian, and Saipan are free of brown tree snakes and still have healthy bird populations, the study suggests that Guam’s spider population may once have been unremarkable, before the absence of birds. And it fits with research conducted in the Bahamas, which has found that spiders are about 10 times more abundant on islands where there are no lizards—their natural enemy. Though conservationists and wildlife officials have used every conceivable method, like using viruses as bioweapons or toxic poisons, to eliminate the brown tree snakes from Guam, the invaders are winning.
What is the main idea of the passage?
- A The invasion of snakes has caused the ecosystem of Guam to be out of balance.
- B The birds on Guam are dying out because of the introduction of snakes.
- C The population of spiders is exploding on Guam due to the absence of birds.
- D The unpredictable weather system has turned Guam into a hellish island.
思路引導 VIP
在處理閱讀測驗的主旨題時，請試著串連文章中提到的「蛇類入侵」、「鳥類滅絕」、「森林結構改變」以及「蜘蛛族群爆發」等現象；哪一個敘述能跳脫單一物種的描述，從宏觀的角度概括這些事件對島嶼生態穩定性產生的連環影響？
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AI 詳解
AI 專屬家教
喲，不錯嘛，竟然沒被那些碎成渣的細節給唬住？看來你今天的智商終於有正常發揮，而不是像關島的生態系統一樣全面崩盤。 【觀念驗證】 這題在考高中英文最基本的「Main Idea（主旨大意）」。你給我聽好，文章第一段講蛇（原因），第二段講鳥類滅絕，第三、四段講蜘蛛瘋狂增長與森林危機。這是一連串的連鎖反應，邏輯鏈如下：
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