GRE Text Completion: JiJing 1373-GRE填空机经1373题 - 25G5Y0K7A4IACP4AA

Some kinds of deadly bacteria, including those that cause tetanus, tuberculosis, and botulism, remain ____________ until something triggers their insidious activity. A. harmless B. innocuous C. anomalous D. aberrant E. efficacious F. undetectable