個人經(jīng)驗，其實什么也不用買，純屬是浪費錢，出去了以后你連課本都讀不完，再買書純屬是負擔（還要搬家，除塵blahblahblah)。

你要實在無聊就看看劇，思考一下怎么和同學get along well。To be honest，我的閱讀完全是出國后啃課本提升的，記的單詞和material都很深刻，因為自己根據(jù)lecture的內(nèi)容進行的二次的積極的學習，和盲目看書有很大區(qū)別的。What I try to say is that it would be a waste of time to read some useless books that have nothing to do with the major you are in. If you really want to be proactive, I would suggest you to log into your school's website and see if there is any required textbook that you can actually buy in China (fake version or pdf, of course). If so, you can also try to search if there is any syllabus that is available online (posted by former students who took the same course with you or shared the instructor with you) and then you can read the textbook according to the syllabus and I believe it would be super efficient.Take-Home Message: Studying abroad is not about studying a foreign language but using a foreign language to study their advanced technology, culture and etc. 千萬不要為了提升閱讀而閱讀，而是為了提升你要學的specific的knowledge的能力而閱讀。