In this section, you will hear one passage. At the end of the passage, you will hear four questions. Both the passage 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、The river overflew when there was too much rain fall.
B、The river overflew in some years.
C、The river overflew several times a year.
D、The river overflew once each year.