16. What is the passage mainly about?

　　Passage Three

　　A cormorant is a large waterfowl that looks somewhat like a seagull

　　and has a long beak with a pouch

　　or sack, on its underside.

　　The birds are often used for fishing in China and Japan.

　　In order to fish with cormorant

　　the fisherman goes out at night in a small boat.

　　He must carry with him a bright light.

　　He must also take with him a number of cormorant

　　each with a cord around its body and a loose metal ring around its neck.

　　The fisherman first puts the birds in the water

　　making sure to keep the strings in his hand.

　　At once the cormorants begin looking for fish.

　　When a cormorant catches a fish, the bird tries to swallow it.

　　However,the metal ring around its neck prevents this.

　　Because he cannot swallow the fish he catches

　　the cormorant stores them in the sack under its beach.

　　When the sacks are full,the fisherman pulls in his birds.

　　Opening their beaks,he reaches into the sacks and pulls out the fish.

　　17. What is a cormorant?

　　18. What is the passage mainly about?

　　19. Why does the fisherman put a metal ring around a cormorants neck?

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