题目内容：
根据以下材料，回答题提示：Jack去图书馆借书，但没有借书证(1ibrary card)。图书管理员Linda为他办理了借书
证，并告诉他每本书可借两个星期，如果需要，可以续借。
Linda：Good morning．51?
Jack：Yes，1 want to borrow a book．
Linda：52?
Jack : No, I don' t have one now.53?
Linda:Well, please fill in this form first.
Jack : OK.(A few minutes later.) Here' s the completed form.
Linda:Thanks.The card will be ready in thirty minutes,and you can take it later.
Jack:Thank you.By the way, 54?
Linda:Well,two weeks.But then,you can renew the book if you still need it.
Jack:I see.Thanks a lot.
Linda :55
第51题答案是( )
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