Listen to part of a lecture in an environmental science class. The professor is discussing renewable energy sources.
Professor: Today we're going to talk about solar power, but not just the photovoltaic panels you see on rooftops. I want to focus on concentrated solar power, or CSP, which uses mirrors to focus sunlight onto a small area to generate heat. That heat can then be used to produce steam and drive a turbine, generating electricity. One advantage of CSP is that it can store thermal energy, for example, in molten salt, which allows electricity generation even after sunset. This is a key difference from conventional solar panels, which require direct sunlight to produce electricity. However, CSP has limitations. It requires a high amount of direct sunlight, so it's only practical in arid regions with clear skies, like deserts. Also, the initial construction cost is high, and it requires a lot of water for cooling, which can be problematic in those same desert areas. Nevertheless, research is ongoing to reduce water usage and improve efficiency. So, while CSP isn't a one-size-fits-all solution, it could play a significant role in regions that receive abundant sunshine.
❓ 문제 What is one advantage of concentrated solar power (CSP) mentioned by the professor?
A. It can generate electricity even when the sun is not shining.
B. It requires less direct sunlight than conventional solar panels.
C. It uses no water for cooling.
D. It is cheaper to build than photovoltaic panels.
✅ 정답
It can generate electricity even when the sun is not shining.
TOEFL Listening Tips
Skim the questions first to predict the content
Watch for signal words in lectures and conversations (however, actually, in fact)
For main idea questions, focus on the beginning; for detail questions, focus on examples and data
For attitude questions, pay attention to the speaker's tone and word choice
Take notes on keywords; don't try to write down every word
