2. You should (歸還) 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 (溫柔的巨人) ” 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.

Inside its huge mouth are great numbers of very small teeth. To count all of them,you’ll need to do some maths. The whale shark’s teeth are arranged in rows. There are between eleven and thirteen rows on each jaw (顎) and around three hundred teeth in each row.

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   A. By giving reasons.

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   C. By comparing sizes.

   D. By using numbers.


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   B. what a whale shark eats

   C. how different fish use their gills

   D. what’s inside a whale shark’s mouth

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1. How lucky we are (live) in this modern city!Everything is convenient.

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() 3. Students in Beijing   away many books to the Hope Primary Schools since 2009.

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2. The air in mountain areas is (good) than that in big cities.

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