下列关于声音的传播的说法中，正确的是

江苏省对口支援新疆伊犁已历时十余年。如今的伊犁，一项项援疆安居工程使百姓的心变暖了、一批批援疆支教老师使学生的心变亮了……这表明（    ）

选出你所听到的句子（  ）

Tom: Hello, Mary. Is this your pencil box?

Mary: No. It's not my pencil box. My pencil box is blue and new.

Tom: Is it Rose's pencil box?

Mary: No. Her pencil box is pink. This pencil box is green and old. What's in it?

Tom: There are four pencils, two pens, six crayons and one ruler.

Mary: Oh, I see. It is Jack's pencil box. His pencil box is lost (丢失).

Tom: OK, let's give (给) it to him.