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、He built a levee to lead the water to a different place.
B、He built a high levee along the river to prevent the water from overflowing.
C、He put bamboo and stones along the riverside.
D、He dug the river deeper for it to hold more water.