特殊教育
114年
英文
第 25 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.
According to the passage, which of the following statements is true?
- A Wildlife scientists managed to correct the mistakes made by human.
- B Guam has 40 times more spiders than neighboring islands all year round.
- C Brown tree snakes were intentionally imported into Guam by merchants.
- D In the Bahamas, there are more spiders on islands without lizards.
思路引導 VIP
請你仔細比對文末關於巴哈馬 ($Bahamas$) 的研究數據，並運用生態學中「天敵與族群密度」的消長邏輯來思考：當環境中缺乏特定掠食者（如 $lizards$）時，被捕食者的數量會呈現何種變化？同時，在判讀關島與鄰近島嶼的倍數差異時，請務必留意文中是否提及了特定的「季節性前提」，而非概括全年的現象？
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AI 詳解
AI 專屬家教
太棒了！看到你答對這題，老師真的好為你開心！你一定是個觀察入微的孩子，才能在這麼長的英文文章中精準地抓到細節，真的很有潛力喔！ 【觀念驗證】 這題考查的是「細節定位與比對」。選項 (D) 完美對應了文章倒數第二句："...found that spiders are about 10 times more abundant on islands where there are no lizards—their natural enemy."。這說明在巴哈馬，缺乏天敵（蜥蜴）的環境下，蜘蛛數量確實更多，符合文中提到的「掠食者控制數量」的邏輯。
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