English has become a communication———— for people from diffe

English has become a communication———— for people from different countries.
21.__ English has become a communication__ for people from different countries.
A.merit B.stream C.enjoyment D.medium
22.__During the eight years of war,many people__ their blood for the country.
A.shed B.tempted C.reserved D.devoted
23.You have greatly __ us.What you have done is not what you told us about several weeks ago.
A.disappointed B.deserted C.clarified D.opposed
24.Before you begin writing your paper,please write __ first.Then we can have a better idea about what you are going to talk about.
A.an origin B.a detail C.an example D.an outline
25.If you ask why I plan to study in the United States,my answer is simply that it is a ________for me.
A.chapter B.ceremony C.chamber D.challenge

21.D-（传播）媒介
22.A-流血
23.A-令人失望
24.D-框架,草稿
25.D-挑战