Listen and Choose a Response
Response 1
0.9sIf we leave at six fifteen, we'll be watching the bus pull away from the stop.
1. Choose the best response.
TOEFL iBT Listening Practice
2026-09-13 · 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
0.8sI'd join the study group tonight, but I promised I'd cover the front desk until nine.
2. Choose the best response.
Listen and Choose a Response
Response 3
1.0sAfter all those revisions, I think we're finally on the same page about the methods section.
3. Choose the best response.
Listen and Choose a Response
Response 4
0.9sDo you know if the biology lab keeps spare goggles, or should I go back to my dorm for mine?
4. Choose the best response.
Listen and Choose a Response
Response 5
0.8sThis box of survey forms is heavier than I expected.
5. Choose the best response.
Listen to an Academic Talk
Academic Talk — Seeing Hidden Drawings with Infrared Reflectography
0.2sPaintings often hide an earlier stage of the artist's work beneath the visible surface.
6.0sConservators can sometimes study that stage with a technique called infrared reflectography.
12.5sThe basic idea is that materials respond differently to infrared radiation than they do to visible light.
19.7sMany paint layers become partly transparent in the infrared range, while carbon-based drawing materials tend to absorb infrared strongly.
29.0sA special camera can therefore record dark lines that lie underneath the paint.
34.4sThese lines may reveal an underdrawing, the preliminary sketch used to plan the composition.
40.5sSuppose an image shows that a painted hand was originally drawn several centimeters to the left.
46.2sThat difference suggests the artist changed the composition while working rather than simply copying a fixed design.
53.4sInfrared images can also reveal abandoned architectural lines or changes in the position of objects.
60.0sBut the method has limits.
62.3sIf an underdrawing was made with a material that reflects infrared much like the surrounding layers, it may remain invisible.
69.2sSo, when reflectography shows no hidden sketch, conservators cannot automatically conclude that the artist never made one.
6. What is the main point of the talk?
7. Why can carbon-based underdrawing lines appear dark in an infrared reflectogram?
8. Why does the professor mention a painted hand that was originally drawn farther to the left?
9. What can be inferred if infrared reflectography does not reveal an underdrawing?
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/发言轮次；不是按文字长度等比例估计。