在ph5.0的缓冲溶液:7In the 18th century writers___hours in coffee houses,discussing the news of the day.

Realistic novel in the 18th century 7In the 18th century writers___hours in coffee houses,discussing the news of the day. how to be successful in the 21th century What are the two products of language development in the 18th century? How do you understand them? Can you tell me something about the great scientists of the 18th century? the last decades of the 19th century Why were there so few American Indians left at the end of the 19th century what was the children \\\'s crusade of the 12th century the first third of the 19th century 这句话是什么意思？ What is the mainsteam of 20th century English literature？100words