中国的科学技术水平，正在飞跃前进。
参考答案：中国的科学技术水平，正在飞速提高。
开放作文。
请根据下面提示，写一篇短文。词数不少于50。
In your English class, you are asked to describe the following picture and explain to your classmates
how you understand it.
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下述（）矿物的硬度最大。
A.石墨
B.黄铁矿
C.金刚石
D.硬石膏
