After reading some other's opinions. It may be D. To be very impatient. But I could be wrong, and many apologies if I am.
Answer: Imperious means with an attitude of authority and expecting obedience.
Explanation: Her attitude is imperious at times.
Answer:
1. Who is Alexander Flemming?
2. What did Flemming study?
3. What chain of events led Flemming to his greatest discovery?
4. How was the first Penicillin tested?
5. How many of the mice given Penicillin survived?
6. What happened in 1945?