what kind of race do the children compete in 其中 do 在句中的作用?

what kind of race do the children compete in 其中 do 在句中的作用? what kind of race do the children compete in?一楼的，用的翻译软件吧 What kind of race do the children compete in?请帮忙解析这个句子,不只是译文. What kind of work do you do? what kind of movies do you like? what kind of movies do you like? what kind of food do they have? What kind of job does David do? what kind of family do you what kind of noodles do you have? What kind of noodles do you like? What kind.of.do.you.like? what kind of do you like What kind of animals do people keep? What kind of ( ) do you play? WHat kind of animals do you like? Do you like what kind of feeling movies,kind of,do,they,what,like