Listen and Choose a Response
Response 1
0.8sWe can spend another half hour debating the title, or we can actually start the presentation.
1. Choose the best response.
TOEFL iBT Listening Practice
2026-09-09 · 5 Listen and Choose a Response + 1 Academic Talk · 9 questions
练习方式：原文默认隐藏。先只听音频作答；需要复盘时可点“显示同步原文”，播放过程中当前句/当前发言会自动高亮。
Listen and Choose a Response
Response 2
0.4sDo you remember whether the chemistry stockroom closes before the evening lab starts?
2. Choose the best response.
Listen and Choose a Response
Response 3
0.3sDidn't Maya say she'd already submitted the room request?
3. Choose the best response.
Listen and Choose a Response
Response 4
0.3sThe field-trip date is still up in the air, so I haven't bought a train ticket.
4. Choose the best response.
Listen and Choose a Response
Response 5
0.3sI can stay another ten minutes, but then I really have to catch the shuttle.
5. Choose the best response.
Listen to an Academic Talk
Academic Talk — How Deep Roots Redistribute Water at Night
0.3sDuring the day, roots usually supply water that is pulled upward toward leaves.
6.5sBut some deep-rooted plants can move water in a different direction at night, effectively redistributing it within the soil.
14.4sEcologists call this hydraulic redistribution.
18.2sWhen leaves close their stomata and transpiration drops, the strong daytime pull toward the leaves weakens.
25.3sIf deep soil is moist while the upper soil is dry, water can enter deep roots, move through the root system, and then leave through shallower roots into the surrounding dry soil.
36.4sThis is not an active pump.
38.5sThe movement is driven by differences in water potential, so the direction can even reverse if the moisture pattern changes.
45.6sResearchers can detect the process with sensitive soil-moisture sensors or by adding a harmless isotopic label to water at one depth and later finding that label at another depth.
56.2sWhy does this matter?
57.7sThe same plant may reabsorb some of the redistributed water through shallow roots the next day.
62.7sNearby seedlings and soil microbes may also benefit from the temporary increase in moisture.
67.9sSo a plant's root system can affect not only its own water supply but also the small-scale pattern of water available to other organisms around it.
6. What is the main point of the talk?
7. Why is hydraulic redistribution especially likely to occur at night?
8. Why does the professor mention adding an isotopic label to water?
9. What can be inferred if shallow soil near a deep-rooted plant becomes slightly wetter overnight during a dry period?
同步原文时间点来自最终 WAV 的 Gemini 3.5 Transcribe 逐词时间戳，并按已知原文强制映射到句子；不是按文字长度等比例估计。