题目内容
（请给出正确答案）
[主观题]
Where are they？A．They are in a shop.B．They are in a library.C．They are in a bookshop.
Where are they？
A．They are in a shop.
B．They are in a library.
C．They are in a bookshop.
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安全生产许可证的有效期为()。
A.一年
B.二年
C.三年
D.五年
