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[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 Meet his lawyer.
　　8、 A Jessic 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 expansinon took place during that period.
　　16、 B Government funding. veduchina
　　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.