Narrator: Listen to part of a lecture in an environmental science class.
Professor: Today we’re going to talk about a surprising contributor to climate change—cow burps. Yes, you heard that right. Cattle produce methane, a potent greenhouse gas, through their digestive processes. Methane traps heat in the atmosphere far more effectively than carbon dioxide, though it doesn’t last as long. So, reducing methane emissions could have a rapid impact on global warming. One promising solution involves changing cattle diets. Researchers have found that adding a small amount of seaweed to cattle feed can reduce methane production by up to 80 percent. However, there are challenges. Seaweed farming on a large scale is expensive and not yet sustainable. Also, some types of seaweed contain compounds that might affect the taste of beef or milk. Despite these hurdles, the potential benefits are significant. If we can overcome the logistical issues, this could be a game-changer in our fight against climate change.
❓ 문제 What is the main challenge mentioned regarding the use of seaweed to reduce methane emissions?
A. A. Seaweed is not effective in reducing methane.
B. B. Large-scale seaweed farming is costly and unsustainable.
C. C. Cattle refuse to eat seaweed.
D. D. Methane from cows is not a significant problem.
✅ 정답
B. Large-scale seaweed farming is costly and unsustainable.
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