Questions 21 to 24 are based on the following news item. At the end of the news item, yon will be given 20 seconds to answer the questions. Now listen to the news.
Jacques Rogge of ______ is also a candidate to replace Samaranch.

A．the main source of humidity
B．the impact of humidity on our world and ourselves
C．how humidity affect our life
D．the damage humidity has done to our world

A. man did not put it to use in war two hundred years later
B. until two centuries more it was used in war
C. not used in warfare until two hundred years later
D. in warfare did not use it two hundred years afterwards