Listen to part of a talk about how noise-cancelling headphones work. – Luyện nghe VSTEP Part 3 – Bài nói, bài giảng

1. What is the main idea behind noise-cancelling headphones?

A. They use sound to cancel out sound.B. They make music louder than the noise.C. They block all sound with thick padding.D. They change noise into music.

2. What does the microphone on the outside of the headphones do?

A. It makes the music louder.B. It records the user's voice.C. It listens to the noise around the user.D. It measures the user's heartbeat.

3. Which sound are the headphones best at reducing?

A. a baby cryingB. a door slammingC. people talkingD. the hum of an aeroplane engine

4. Why is the padding around the ears still important?

A. It makes the headphones cheaper.B. It blocks some of the higher sounds.C. It holds the microphone in place.D. It keeps the battery warm.

5. According to hearing experts, how can these headphones help protect hearing?

A. They switch off automatically after an hour.B. They block all sound completely.C. People don't need to play music so loudly.D. They warn users about loud noises.