In this section, you will hear several passages.
Listen to the passages carefully and then answer the questions that
follow. Questions 11 to 13 are based
on the following passage. At the end of the passage, you will be given 15
seconds to answer the questions. Now listen to the
passage. The speaker states that the Stone Age was so named because ______.
A．it was very durable B．the tools and weapons were made of stone C．there was little vegetation D．the people lived in caves