[A] the face-centred cubic structure of the opals [A] 蛋白石面部中心的立方结构
[B] the light scattering properties of the opals. [B] 蛋白石光泽发散的特性
[C] the tiny polystyrene spheres of the opals. [C] 蛋白石聚苯乙烯球体
[D] the flexible film of crystals of the opals. [D] 蛋白石晶体的弹性薄膜
[答案] A
[难度系数] ☆☆
[分析] 细节题。文章第二和三段都提到了the face-centred cubic structure,尤其是文章第三段最后指出As the mixture was baked, the spheres moved naturally into a face-centred cubic structure,即这种乳白色的物质是许多聚苯乙烯球体加热后形成了面部中心的立方结构,从而可以闪光。因此,是模仿了面部中心的立方体结构。答案为A选项。
3.The flexible film of crystals Dr Baumberg has finally got is an ideal material for currency because _____ 3.Baumberg博士最后的弹性警惕薄膜是理想的制作钞票的物质,因为_____
[A] it can be used to coat malleable surfaces so that the currency could have iridescent hues. [A] 这种物质可以用来做有延展性表面,这样钞票就可以有特别的光波了。
[B] the colour change as the film is bent so that the currency could be identified precisely. [B] 薄膜弯曲后颜色会改变,这样钞票就可以精确地辨认出来。
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