多选题 Many subatomic nuclear particles are ______ and nearly ______: they are hard to track as well as to detect.
【正确答案】 C、E
【答案解析】[解析] ●冒号表示前后同义重复,后文是对前文的解释。
●后文说难以追踪和探测,所以两空应该分别体现这两个特点。
●unstable不稳定的,charged带电荷的,elusive难以捕获的;explosive爆炸的,imperceptible无法察觉的,indivisible不可分割的。答案选CE。