近年来，影响北京的浮尘、扬沙和沙尘暴天气表现出加剧的趋势，但大多数沙源却不是来自北京，其沙源最有可能来自：

几种物质的溶解度曲线如右图。则下列说法正确的是

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Cat: Good morning, Mr Tiger.

Tiger: Good morning, Mr Cat. What date is it today? Is it the 3rd of July?

Cat: Yes.

Tiger: Oh, today is my birthday.

Cat: Happy birthday! What would you like as a birthday present? How about a big cake with some candles on it?

Tiger: No, thank you. I'd like one hundred rabbits.

Cat: One hundred rabbits? I'm sorry, Mr Tiger. I haven't got any rabbits for you.