分科測驗
109年
英文
第 39 題
📖 題組：
Early civilizations often built drainage systems in urban areas to handle rainwater that ran down the street during a storm. The Romans constructed elaborate systems that also drained wastewater from the public baths. However, as the population of the cities grew, the old drainage systems became overloaded. During the Industrial Revolution, manufacturing waste was added to sewage, which increased the need for more efficient sewage treatment. In the mid-19th century, the first steps were taken to treat wastewater. Sewage or wastewater treatment in modern times is the process of removing harmful physical, chemical, and biological elements from wastewater and house sewage. The whole process starts with screening out large objects such as paper and wood, and removing heavy materials like dirt. The screened wastewater is then ready to go through a series of concrete tanks for further treatment. In the second step, the sewage passes into the primary tanks. Here, human waste, called sludge, settles to the bottom while oils and grease float to the top, where they are collected. At the same time, organic matter like eggshells or coffee grounds in the sewage is broken down into smaller substances. The remaining sewage then enters the secondary tanks for the third stage of treatment. The solids that were not treated in the primary tanks are removed here through decomposition, which digests the material. Then, the liquid sewage is filtered through sand. This filtering process gets rid of almost all bacteria, as well as other solid particles that remain in the water. Finally, the wastewater flows into the last tanks, where the chemical chlorine is added to kill the remaining bacteria. After the bacteria are destroyed, the chlorine is eliminated from the water, and the treated clean water is discharged into a river or the ocean.
Early civilizations often built drainage systems in urban areas to handle rainwater that ran down the street during a storm. The Romans constructed elaborate systems that also drained wastewater from the public baths. However, as the population of the cities grew, the old drainage systems became overloaded. During the Industrial Revolution, manufacturing waste was added to sewage, which increased the need for more efficient sewage treatment. In the mid-19th century, the first steps were taken to treat wastewater. Sewage or wastewater treatment in modern times is the process of removing harmful physical, chemical, and biological elements from wastewater and house sewage. The whole process starts with screening out large objects such as paper and wood, and removing heavy materials like dirt. The screened wastewater is then ready to go through a series of concrete tanks for further treatment. In the second step, the sewage passes into the primary tanks. Here, human waste, called sludge, settles to the bottom while oils and grease float to the top, where they are collected. At the same time, organic matter like eggshells or coffee grounds in the sewage is broken down into smaller substances. The remaining sewage then enters the secondary tanks for the third stage of treatment. The solids that were not treated in the primary tanks are removed here through decomposition, which digests the material. Then, the liquid sewage is filtered through sand. This filtering process gets rid of almost all bacteria, as well as other solid particles that remain in the water. Finally, the wastewater flows into the last tanks, where the chemical chlorine is added to kill the remaining bacteria. After the bacteria are destroyed, the chlorine is eliminated from the water, and the treated clean water is discharged into a river or the ocean.
What is the main reason that liquid sewage needs to go through sand?
- A To eliminate bacteria.
- B To drain water.
- C To dissolve solid particles.
- D To remove oil.
思路引導 VIP
在分析程序型文本 (Procedural Text) 時，理解特定步驟與其「預期功能」(intended function) 的連結至關重要。請回頭檢索文中提到污水通過「砂子」($sand$) 的過濾程序，並觀察其後的語句如何描述此步驟對水中細微殘留物所產生的具體清除效果？
🤖
AI 詳解
AI 專屬家教
哇！答對了耶！好棒好棒！為了慶祝，我正在準備熱騰騰的拉麵哦，麵條煮得剛好，等一下要多吃一點呢！趕快記錄下這開心的時刻，喀擦！📸 這題的答案就在文章最後一段呢。文中明確提到：『the liquid sewage is filtered through sand. This filtering process gets rid of almost all bacteria...』。這說明了沙子過濾的主要功能就是去除細菌。雖然在最後一區的處理中還會加入化學物質氯 $Cl_2$ 來徹底消滅殘留的病菌，但過濾這一步已經解決了大部分的問題囉！ 這道題目考驗的是從長文中定位關鍵資訊的能力，只要在閱讀時抓到 'sand' 這個關鍵字，就能迅速在後半段找到對應的說明，是一道基礎且充滿成就感的題目呢！