题目

九年级英语阅读理解【英语周报九年级新目标HNY第16期】
Each year in late spring and early summer, thousands of sharks pass through Florida waters(水域). These sharks migrate(迁徙) north along the east coast(海岸) of the USA after having spent the winter in warmer southern waters.
But this year, the sharks migrated earlier than usual. Many southern Florida beaches were closed to swimmers in early March when as many as 15,000 sharks showed up in coastal waters. Researchers believe the migration happened earlier than usual because of warmer weather.
During a migration, as many as 1,000 sharks can be in a 64m2 area. Some of the sharks continue migrating up the east coast, but many remain in the warm Florida waters for the summer. Though the sharks travel close to shore(岸) during their migration, they usually remain in deeper waters when they are not migrating.
Over 10 different types of sharks are common in Florida waters. But they are usually not a threat to humans: Most of them eat fish and

提问时间：2021-01-22

答案

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