砂糖和沙子混在一起不放进水里怎样分开?

1、砂糖和沙子混在一起,不把它们放进水里,你怎样把它们分开?

 
2、有一次,老李买了一只狗,买了一篮子骨头。他休息时,用一根5米的绳子将狗拴在路边树上,将骨头放在离狗8米的地方,但过了一会儿.他发现骨头被狗叼走了,你知道为什么吗?
 
 
 
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