单项选择题
A.through first-hand experience B.in the very countries C.through friendships with people D.through various sources of experience
A.If you are a tourist you will never have advantages in the USA. B.The first-hand experience will help you understand the culture in the USA, C.Do not hesitate to say "This summer I'll be studying in the USA." D.You can make a good decision after you read all the articles.
A.outside the place where you study B.outside the United States C.who will ask you to stay longer in the USA D.who will continue to keep in touch with you after you return to your own country