1. 밑줄 친 it이 가리키는 것으로 가장 적절한 것은? [1점]

Nothing can be checked out or renewed without it. If you reside in this area, you may get it free of charge. Kids under 18 need their parent’s signature on the registration form to receive it. The standard loan period is 21 days. Books can be renewed once for the original loan period unless they are on reserve. Videos and DVDs can be loaned for 2 days and cannot be renewed. Borrowers are responsible for returning items on time and in good condition.

① a cash card                  ② a business card                  ③ a meal coupon

④ a library card                ⑤ a discount coupon