厨房里发生的下列变化中，属于物理变化的是

如图所示，斜面高lm，倾角θ=30°，在斜面的顶点A以速度v_o水平抛出一小球，小球刚好落于斜面底部B点，不计空气阻力，g取10m/s²，求

金属晶体具有延展性的原因是（　　）

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阅读下列短文，从每题所给的A、B、C和D四个选项中，选出最佳选项。

                                              Grandmother's Favourite Doll (玩具娃娃)

 A little girl had a doll. She loved it so much that she would treat it with great care, even though her friends would laugh at her for being so careful.

 As time passed, the girl grew up, moved houses, became an adult, married, had children, and finally became a lovely little old woman with many grandchildren.

 One day, she returned to her hometown, found her original house, and went in. Among hundreds of old things, the now-old little girl found her doll. It was as well looked after as before. She took it home with her and gave it to her granddaughter. Her granddaughter loved it.

 Each time the old woman saw her granddaughter playing with the doll, tears (眼泪) of joy would roll down her cheeks (脸颊). She was so glad to see now it was in the hands of her granddaughter.