【单选题】听力原文:W: Dr. Steven, I am thinking about changing my major before the end of the freshman year. M: What are you studying now? W: I am taking three general requirements, American history and American li...
【简答题】1 This is mainly due to the _____________ disposal of rubbish by people. 2 Many in our country do not know the pain of _____________, but we can listen to those who do. 3 I want to show you a little b...