Passage One Questions 26 to 28 are based on the passage you have just heard.

A．By crushing large amounts of stone.
B．By causing mud or sand to mix with ocean water.
C．By creating large waves on the Surface of the ocean.
D．By greatly increasing the ocean’s depth in some areas.

A．To practice driving with an experienced driver.
B．To drive under normal highway condition.
C．To have the car checked by the license officer.
D．To use it as an identification card.