Answer:
Explanation:
Flashback. past events are presented during current events. Irony. a person or situation is not as it would seem. Idiom. a word or phrase not to be taken literally.
Answer: exposure
Explanation:
"To expose" is a verb that refers to putting someone at risk from something harmful. Exposure refers to the act of being exposed to something dangerous, such as radiation. So the best word to complete the sentence is "exposure":
Marie Curie conducted pioneering research on radioactivity and discovered the radioactive elements, not knowing how deadly exposure to radiation could be.
