[音频]Decide whether the following statements are true（T）or false （F）.( ) 1. Wikipedia has millions of articles in about 20 languages.( ) 2. Scientists doing AIDS research were unable to solve a problem for almost 10 years.( ) 3. Scientists put the problem on the Foldit site, and gamers from the U.S. solved it in 10 weeks.( ) 4. Today, millions of people work together in ways that weren't possible 20 years ago.

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.

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.

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.

A. 存在
B. 完整性
C. 计价和分摊
D. 权利和义务