题目内容：

    As people try to keep social engagement during self-isolation, citizen science offers a unique opportunity.

Defined as "public participation and collaboration in scientific research", citizen science allows people to use technology to unite towards a common goal —from the comfort of their homes. And it is now offering a chance to contribute to research on the coronavirus pandemic.

With so many of us staying home, this could help build a sense of community where we may otherwise feel helpless, or struggle with isolation.

Anyone is welcome to contribute. You don't need expertise, just time and interest. Projects exist in many forms, catering to people of diverse ages, backgrounds and circumstances. Many projects offer resources and guides to help you get started, and opportunities to collaborate via online discussion forums.

Scientists worldwide are racing to find effective treatments and vaccines to halt the coronavirus pandemic. As a citizen scientist, you can join the effort to help tackle COVID-19, and other infectious diseases.

Foldit is an online game that challenges players to fold proteins to better understand their structure and function. The Foldit team is now challenging citizen scientists to design antiviral proteins that can bind with the coronavirus.

The highest scoring designs will be manufactured and tested in real life. In this way, Foldit offers a creative outlet that could eventually contribute to a future vaccine for the virus.

Another similar project is Folding@home. This is a distributed computing project that, rather than using you to find proteins, uses your computer's processing power to run calculations in the background. Your computer becomes one of thousands running calculations, all working together.

1.Where does a citizen scientist work?

A.In the office. B.At research center.

C.In the factory. D.At home.

2.Who can be a citizen scientist?

A.Anyone who has time and interest. B.The expert who is interested.

C.People who are well educated. D.Doctors who are experienced.

3.How can a citizen scientist join in the effort to help deal with the COVID-19 and infectious diseases?

A.He can play Foldit an online game and get the highest scores.

B.He can do experiments about COVID-19.

C.He can design a new game about COVID-19.

D.He can help build a sense of community.

4.What is true about Folding@home?

A.It is the same project as Foldit.

B.It is a computer project using you to run calculations by computer.

C.It is a project using you to find proteins.

D.It is done by experts.