14. option ['ɔpʃən] n. 选修科目
Ex: She is taking French as an option next year
14.assignment [ə'sainmənt] n. 功课，任务
Ex: I have a lot of reading assignments to complete before the end of term.
15.presentation [.prezen'teiʃən] n. (国外学生在课堂上所做的)演讲
Ex: The speaker gave an interesting presentation on urban transport.
16. field work 野外考察 实地考察
Ex：Offered by most departments for academic credit, field work enables students to examine the way the theories and the practical experiences of a particular discipline interact.
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