2. 外语
  3. Many subatomic nuclear particles are (i)______and nearly (ii)______: they are hard to track as well as to detect.

Many subatomic nuclear particles are (i)______and nearly (ii)______: they are hard to track as well as to detect.

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问题 Many subatomic nuclear particles are (i)______and nearly (ii)______: they are hard to track as well as to detect.
选项
答案C，E
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。
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