During period of isolationism why were the Chinese successful in  improvising new rules governing trade with foreigners

How do you know ? what does verne have his characters say and/or that reveal that attitude ?

During the early neolithic era, people relied on domesticated animals to provide each of the following except a. hides for clothes b. labor to pull plows c. manure for the soil d. meat, cheese, and milk for food

Why was l ‘enfant dismisses from his job? what activity was it suppose to stop?me, i beg you