what does"cross-sec-tion"meaning?their work s present a good cross-sec-tion of life in china

what doescross-sec-tionmeaning?their work s present a good cross-sec-tion of life in china Cross cross cross cross, cross cross cross why does chicken cross the road?这句话如何回答? What does she like? what does Bob do? What does your mother What time does school what does she do? What does tom do? what does friday do What does she do? what does chinese mean