题目内容：
根据下面内容，回答题：In June of 1973, nine whales beached on the Florida coast. Beaching means swimming out of theocean onto the beach, and usually dying there. No one knows why they do it, but a number of whalesbeach themselves every year. Some people think beaching is an accident.
Perhaps the whales get confused. Scientists who studied the beaching of three dozen whales inAustralia think the whales may have been confused by loud noises. Whales can tell where they are bysounds. They send out sounds and listen as they travel past or bounce off objects. Two days beforethese thirty-six whales beached, loud guns had been fired for two hours. The loud sounds may haveconfused the whales. Their confusion might have caused them to wander into low water.
Whatever the reason whales beach, it is a sad event. People try to save them, but very fewbeached whales live. One whale that was rescued from beaching in Florida lived for forty-five days.That is the longest a beached whale has ever survived. And it lived that long only" because it got at-tention from doctors.
All over the world, scientists rush to whale beachings as soon as they hear about them. They hope to learn why whales beach, and how to save them.
The subject of this passage is__________. A．the Florida Beaches
B．Beached Whales
C．Whale Sounds
D．Medical Treatment of Whales
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