题目内容
（请给出正确答案）
If Yumi returns a book two days after the loan period has ended,
A．she will have to pay a fine.
B．she will have to pay 10 cents.
C．it won't cost her anything.
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更多“If Yumi returns a book two day…”相关的问题
Who advised Yumi to join the local library？
A．her tutor
B．Mary Ann's tutor
C．the librarian
D．Mary Ann and Yumi's flatmate
Why hasn't Yumi been to the university library yet？
A．She couldn't attend the orientation activities.
B．She has been sick all week.
C．She had to go to her lecture.
A、increasing returns to scale.
B、decreasing returns to scale.
C、constant returns to scale.
D、increasing returns to scale if x + y ＞ 1 and decreasing returns to scale otherwise.
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