CLEAN: Hong Kong scans travellers from Japan for radiation

The video begins with a simple exchange of words, 'Knock, knock' followed by 'Yep', indicating a basic interaction or greeting scenario.

What is the initial action described in the video?

• A shout

• A wave

• A knock

• A greeting

What is the response to the initial action?

• No response

• A question

• An affirmation

• A denial