另外请问，申请资料的checklist上要求附上：
(1) Statement of employment history in the U.S. within the past 6 years,
including dates, employer, job title, and visa classifications.
(2) Summarized statement of prior relevant work experience written
by the employee.
我在学期间有一个2周的CPT在B大学，和一个3周的CPT在C大学实习，
当初跟我学校的international office申请CPT时，
international office有要求我上缴这两间大学的job offer letter才发CPT，
两间大学都有直接寄给international office，
但两者都只是无薪实习，这样子算是employment和relevant work experience，
而需要列在这两份statement上吗？
USCIS网站上对于CPT的叙述：http://shorturl.at/sEQS3
CPT is any alternative work/study, internship, cooperative education,
or other type of required internship or practicum that is offered by
sponsoring employers through cooperative agreements with the school.
所以还要解读为employment/work吗？
谢谢！