He___________________________(减少，削减) coffee and cigarettes，and ate a balanced diet．

A．the sophisticated technology of focusing sounds under water
B．the capability of sound to travel at high speed
C．the unique property of layers of ocean water in transmitting sound
D．low-frequency sounds traveling across different layers of water

A．The houses for sale are of poor quality.
B．The houses are too expensive for the couple to buy.
C．The housing developers provide free trips for potential buyers.
D．The man is unwilling to take a look at the houses for sale.