The Noodle House has really good noodles. They are cheap, and they are great! You can get small, medium, or large bowls of noodles.

    The Noodle House has some specials. Special 1 has beef and tomato and is only ￥5. Special 2 has mutton and cabbage. It is ￥6. And Special 3 has chicken and carrot. It's only ￥8. I like it best.

    You can get some other great food at the Noodle House. For example, you can get 16 dumplings for ￥11. You can get great desserts! You can get strawberry, banana and orange ice cream.

    They are all nice! Try the Noodle House soon!

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一个学生估算一块木头下面鼠妇的种群数量。她捉了40只鼠妇，将它们标记后放回，并与该种群中的其他个体混合在一起。24h后，她又捉了40只鼠妇，在新捉的鼠妇中，只有16只是有标记的。假定在24h内，鼠妇无死亡，没有受伤害，无迁入与迁出，则鼠妇的种群数量为（）