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2. You should (归还) the books to the library as soon as possible.

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Is the whale the world’s largest fish? No. It looks like a fish,but it is not. Then what’s the world’s largest fish? It's the whale shark.

Although the whale shark is our biggest fish and lives in many seas around the world,few people have ever heard of it. Scientists have not studied whale sharks for very long. So we know little about them.

A whale shark is sometimes called “a gentle giant (温柔的巨人) ” It likes to be alone and doesn’t care a bit about divers or humans. The biggest whale shark weighed 55 ,500 kg and was nearly 20 metres long.

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() 43. How does the writer help us know what the whale shark’s mouth looks like?

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