Listen to the recording once and choose the right answers to the questions you hear.[音频]

A. It means that we shouldn't solve a problem alone.
B. It means that we should collaborate with others worldwide.
C. It means that we can make things easier by working with others.
D. It means that we can put our problem on certain websites.

2

A. It's a useful collaborative tool.
B. It's used worldwide.
C. Most contributions to the site are scientists.
D. It relies on people adding information to it.

3

A. It was set up by an international team of scientists.
B. It is a scientific problem that scientists have been studying for almost ten years.
C. It is a game just for fun.
D. It turns scientific problems into a game.

Who are described in the recording?