GRE Text Completion: Kaplan-GRE填空Kaplan - U7U4A2_3K00004OE_

Animals rely on a combination of internal traits and external behaviors to survive. Bees, for example, have a keen sense of smell that enables them to (i)____________ kin from foe. Their ability to resist (ii)____________, by contrast, is deficient, making them vulnerable to disease. Scientists speculate that the observed extensive grooming among hive mates (iii)____________ various diseases, thus protecting the colony. A. promulgate B. pathogens C. minimizes incursions by D. discern E. cold F. implicates replication of G. arbitrate H. poison I. simulates action by