题目

   Last year, we spent Christmas and New Year in Queensland,Australia. The beaches there were beautiful, and we spent a lot of time playing by the sea, swimming and surfing. One day, we were on a beach just south of a city called Cairns. My little sister was looking for shells in the sand down near the waves when she shouted to me, “Hey, Lan! Look what I’ve found!” I ran down to have a look, and saw her pointing at a strange black object that was half buried (掩埋) in the sand, “What is it?” she asked. I said I didn’t know.    Just then, my father came over, “Are you enjoyi If we do nothing, the oceans ______ fish desserts.A. become B. became C.will become D. are becoming