1、Excuse me.Could you tell me the way______the bookstore?---

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1、Excuse me.Could you tell me the way______the bookstore?----Sorry,I do not know.I am____here.A、to;stranger B、of;new C、to;new D、to;newer2、一游泳者沿河逆流而上,与A处将携带的物品（可漂流）遗失,在继续前有30分钟后发现物品遗失,即刻顺流返回,在距A处3千米的B处追到物品,问此河水流速是多少?（用一元一次方程解答）

1.A 2.设游泳者在静水中的游泳速度为X千米/小时,水流速度为V千米/小时.
则即刻顺流返回时,游泳者距遗失物品3000+0.5X(千米)
顺流游泳的速度是X+V千米/小时.有
(3000+0.5X)/(X+V)=3000/V
解得V=6000千米/小时.
此河水流速是6000千米/小时
在距A处3千米的B处追到物品,这是顺流游泳与物品漂流的路程差.
时间是30分钟=0.5小时.所以,此河水流速是3000/0.5=6000千米/小时
再问：用一元一次方程解答

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