Questions 21 and 22 are based on the following news. At the end of the news item, you will be given 10 seconds to answer the questions. Now listen to the news. Violence flared throughout the West Bank and Gaza on ________.

A．By good sense of water waves made by quarries.
B．By good sense of smell and electrical magnetic power.
C．By good sense of light.
D．By good sense of blood.

A．About 2,000.
B．About 1,000.
C．Aborn3,000.
D．About4,000.