7. sınıf ingilizce 2. ünite Biographies (Biyografiler) Test 1

Marie Curie's notebooks are still radioactive and stored in lead-lined boxes. She carried radioactive isotopes in her pocket and stored them in her desk drawer, unaware of their health effects.
What does this information suggest about Marie Curie's time?

A) Safety protocols for handling radioactive materials were well-established
B) The dangers of radiation were not fully understood
C) Radioactive materials were not used in research
D) Lead-lined boxes were commonly available