GRE Text Completion: Fundamental 24 Sets-GRE填空基础24套 - 8Q9AGLG8O6EDRUY6!

Whether substances are medicines or poisons often depends on dosage, for substances that are (i)____________ in small doses can be (ii)____________ in large. A. useless B. miraculous C. mild D. toxic E. curative F. innocuous