In this section, you will hear one news report. At the end of the news report, you will hear two questions. Both the news report and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A), B), C) and D).A、About 3,000 years.
B、About 300,000 years.
C、About 100,000 years.
D、About 200,000.