Choose the meaning of the bold word based on this sentence in F451: "With his symbolic helmet numbered 451 on his stolid head, and his eyes all orange flame with the thought of what came next, he flicked the igniter and the house jumped up in a gorging fire that burned the evening sky red and yellow and black."

"With his symbolic helmet numbered 451 on his stolid head, and his eyes all orange flame with the thought of what came next, he flicked the igniter and the house jumped up in a gorging fire that burned the evening sky red and yellow and black."

Stolid, the bold word based on this sentence in f451 place means:

Steady, calmed, dependable, of little emotion, or low animation.

Explanation:

Stolid is an adjective word to qualify or assign a characteristic to a subject. The characteristic it provides is of a steady, calmed, or low animated object. It comes from Latin stolidus and french stolide which means obsolete in french and insensible or slow in Latin. In other words, is something that won't move fast and that will remain steady due to its nature.  

the following key ideas correctly express the key sentence.

restate key idea: most people can learn to swim in ten short lessons.

restate key idea: the majority of water-accident victims require mouth-to-mouth breathing.

restate key idea: an empty, tightly closed gallon jug will support a tired swimmer.  

restate key idea: first aid is to prevent accidents as well as assist in rescue.

explanation: the key idea needs to have the same topic as the key sentence (drowning and safety).