Read the excerpt from The Hot Zone.Jerry was terribly keyed up. In the past he had lectured Nancy on the dangers of working with Ebola in a space suit, and now he was leading a team into an Ebola hell. At the moment, he didn't care what happened to himself, personally. He was expendable, and he knew it.
A
necessary to an operationB
knowledgeable about a topicC
capable of being sacrificedD
useless in a specific situation