听力原文：A young man who refused to give his name dived into the river yesterday morning t

听力原文： A young man who refused to give his name dived into the river yesterday morning to save a twelve-year-old boy. The boy ran away after he was rescued. He had been swimming in the river and had caught his foot between two concrete posts under the bridge. He shouted out for help. At the time a young man was riding across the bridge on his bicycle. He quickly got down and dived into the fiver. He then freed the boy' s foot and helped him to the river bank where a small crowd had collected. The boy thanked his rescuer sincerely, then ran off down the mad. He was last seen climbing over a gate before disappearing over the top of the hill. The young man who was about 20 years of age said, "I don't blame the boy for not giving his name. Why should he？ If he wants to swim in the river, that' s his business. And if I want to help him, that's mine. You can not have my name either." He then am back to the bridge, got on his bicycle and rode away.

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A．He fell into the river but couldn't swim.

B．He fell into the river together with his bike.

C．He had his foot caught between two posts in the river.

D．He dived into the river but couldn't reach the surface.