GRE Text Completion: Fundamental 24 Sets-GRE填空基础24套 - 90Z6O0A2P9XPE_YA!

Because these speeding particles' compositions were quite different from those of other low-energy cosmic rays, scientists dubbed them ____________ cosmic rays. A. abnormal B. transitory C. resilient D. anomalous E. ephemeral F. intermittent