我州有一种可食用的野生菌，上市时，外商李经理按市场价格30元/千克收购了这种野生菌1000千克存放入冷库中，据预测，该野生菌的市场价格将以每天每千克上涨1元；但冷冻存放这批野生菌时每天需要支出各种费用合计310元，而且这类野生菌在冷库中最多保存160元，同时，平均每天有3千克的野生菌损坏不能出售。

（1）设x天后每千克该野生菌的市场价格为y元，试写出y与x之间的函数关系式；

（2）若存放x天后，将这批野生菌一次性出售，设这批野生菌的销售总额为P元，试写出P与x之间的函数关系式；

（3）李经理将这批野生茵存放多少天后出售可获得最大利润W元？

（利润=销售总额-收购成本-各种费用）

用所给词的适当形式填空。

1. I have never dreamed of _____ (visit) any Disneyland in the world.

2. —How long have you been _____ (sleep) in the small room?

    —For over three years.

3. —We can see lots of Disney characters _____ (walk) around the Disneyland all the time.

    —Yes, and I enjoy them a lot.

4. It is a _____ (real) interesting job, and I like it.

5. It's best _____ (travel) in China in spring, because the weather is fine at that time.