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（北京导航  李勇全、王轶群、、 郑景婷  提供）
听力答案
1.  C) They knew none of the other guests at the party.
2.  B) To the dentist's.             
3.  C) Dr. Andrews used to keep his patients waiting.
4.   A) Tom is usually talkative.          
5.  D) To get the seminar schedule for the woman.  
6.  A) The woman has to get the textbooks in other ways.
7.  B) Give a speech.                    
8  A) Jessie always says what she thinks.   
9.   D) Helen is quiet.
10.  D) Jimmy's words are often not reliable.  
 
11.  C) It has done more harm than good in the southern USA.
12.  B) They will soon be overgrown with kudzu.
13. C) The climate there is unfavorable to its growth.  
14.  D) An association of teachers and scholars.
15.  A) Its largest expansion took place during that period.  
16.  B) Government funding.           
17.  C) He started the organization Heifer International.
18.  A) To help starving families to become self-supporting.
19.  A) They should help other families the way they have been helped.
20.  B) It has helped relieve hunger in some developing countries.