(单选题)
What’s the problem of the semiconductor approach?
A.A semiconductor absorbs much of the visible spectrum, but only reflects red.
B.A semiconductor’s color is caused by chromium atoms which are very unstable.
C.When crushed, the semiconductor pigment will fade to dullness.
D.The band gaps which a semiconductor’s color depends on, can be altered by exposure to energy.
参考答案：D
参考解析：
细节理解题。利用semiconductor approach可定位答案在第六段，根据第六段前三句“Inevitably, the semiconductor approach does bring problems of its own. A semiconductor’s color depends on a phenomenon called its band gap. This is the ease with which its atoms can shed electrons.”和第五、六句“Unfortunately, band gaps can, themselves, be altered by exposure to energy in the form of heat or light. That changes the pigment’s color.”可知，半导体方法本身也会带来不可避免的问题。一个半导体的颜色取决于一种被称为带隙的现象，因此它的原子可以轻易地释放电子。不幸的是，带隙本身可以通过暴露于热或光形式的能量中而改变。这就改变了色素的颜色。故选D。
返回顶部