听下面一段材料,回答第1至3题. |
1. When did the story mentioned in the talk take place? |
A. In 1900s. B. In 1800s. C. In 1700s. |
2. Why did Dr. Carroll do such an experiment? |
A. To make a drug. B. To prove a guess. C. To cure a patient. |
3. How did the experiment turn out? |
A. Dr. Carroll lost his life. B. Dr. Carroll survived. C. Dr. Carroll was disabled. |