到你的Common App帐号登入，加上Carnegie-Mellon为目标学校後，左边supplement 其中应该会有CMU一项，点进去就好了。作文应该是为何选CMU和为何选系Please submit a one-page, single-spaced essay that explains why you have chosen Carnegie Mellon and your particular major(s), department(s) or program(s). This essay should include the reasons why you've chosen the major(s), any goals or relevant work plans and any other information you would like us to know. If you are applying to more than one college or program, please mention each college or program you are applying to. Because our admission committees review applicants by college and programs, your essay can impact our final decision. Please do not exceed one page for this essay.