請依下文回答第 51 題至第 55 題：
        One of the primary risks of being a firefighter is that of personal physical injury. Firefighters aresusceptible to burns, smoke __51__ and crush injuries from collapsing structures. They can suffer fromheat exhaustion, as well as long-term job-related illnesses such as asthma, persistent coughing, heartdisease, cancer and lung damage. __52__ the highly physical nature of the job, all matter of bodilyharm can befall firefighters in the line of duty. Some physical fallout from the profession may notmaterialize __53__ years down the road. In addition to the physical perils, firefighters face the potentialfor mental trauma, particularly in situations involving mass __54___ . As first responders on the scene,firefighters and other rescue personnel are often faced with the high stress, high stakes environment oftrying to attend to as many people as possible, remove them from danger and assist in aiding treatment,often __55__ their duties in tenuous or unfolding situations. The elevated stress levels don’t alwaysdissipate when they leave the scene.
【題組】51
(A) adaptation
(B) hallucination
(C) inhalation
(D) manifestation