4　Probably she wont know. Ask her whether fresh water or salt water freezes into ice first. If you live near the sea and have a cold winter， she should know fresh water freezes first as she will have seen that happen. Show her how to test the idea by half-filling two paper cups with water， adding salt to one. Then put them in the icebox and check every three minutes. Write the results in a table. The conclusion will be that salt changes the behaviour of water. Thinking about the string， we see the salt turned some of the ice into water. Then the salt went away into the water and the ice froze again leaving the string attached.

　　5　Then you can ask， Will water with salt boil at the same temperature as water without salt? She can think， tell you her idea and (taking care because of the heat) you can test it in the kitchen.

　　23 Paragraph 1　　　　　.

　　24 Paragraph 2　　　　　.

　　25 Paragraph 3　　　　　.

　　26 Paragraph 4　　　　　.

　　A.What exactly is science?

　　B.How do you find an explanation?

　　C.What topics do you need?

　　D.How do you answer your childs questions?

　　E.Where does your child study science?

　　F.How do you set up the experiment on salt and water?

　　27 When your child asks you questions， you should give her　　　　　。

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