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问题描述：

[单选] 在断裂前材料发生不可逆永久变形的能力称为（）
A．塑性 B．强度 C．硬度
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答案解析：无
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上一篇：金属的（）越好，则其锻造性能就越好。 下一篇：用拉伸试验可测定材料的（）指标。

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If you can’t see anything， do you think you’ll have a nice future？ Xiong Linghao， a 19-year-old pianist， is giving us a great answer．The girl comes from Mianyang， Sichuan． She lost her eyesight （视力） not long after she was born． Luckily， music helps her． Thirteen years ago， she started to learn to play the piano． Different from other piano learners， she could only learn by “hearing” music in the beginning．问题 How old was Xiong Linghao when she began to learn to play the piano？
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