What’s the problem of the semiconductor approach?

参考解析：

细节理解题。根据文章第六段前五句“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. The process of shedding requires energy, often in the form of light, so a substance’s band gap help determine which frequencies of light it absorbs and which it reflects. Unfortunately, band gaps can themselves, be altered by exposure to energy in the form of heat or light”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。脱落的过程需要能量，通常以光的形式，因此，物质的带隙有助于确定它吸收和反射的光的频率。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。