There are a lot of interesting things living in the sea. There are many types of fish and many other animals. There are also many types of plants. There are even some animals which have a lot in common with you. They are mammals living in the sea. How much do you know about creatures that live in the sea? Do you want to know more about the food chain（鏈）in the sea?

In the sea, all sea creatures get food from other sea creatures. At the first link of the food chain are the sea plants and plankton (浮游生物). Plants are found only in the sunlight zone where there is enough light for them, however, animals are found at all depths of the oceans though their numbers are greater near the surface where food is enough. Many kinds of fish and animals, such as the snail, shrimp, jellyfish, and sea star eat the plankton. The small animals and fish that eat plankton then become food for larger fish, such as the tuna and mackerel. These fish are then eaten by larger fish and animals, such as the shark and dolphin. The shark and dolphin are at the top of the food chain in the sea. Sharks are very dangerous so many people are eaten by them in the sea. But why the number of the shark is becoming smaller and smaller? And who eats the shark? Check out the menu at a seafood restaurant next time you are eating there. Don't be surprised if you find shark on the menu.

1.The underlined word “creatures” means ________.

A.生物 B.維持 C.奇特 D.藻類

2.Plankton is food for ________.

A.the snail B.shrimp

C.sea star and jellyfish D.All the above

3. ________ are at the top of the food.

A.The sea plants B.The small fish

C.People D.The shark and dolphin

4.What’s the passage mainly talk about?

A.Food Chain in the Sea B.The sea plants

C.Dangerous sharks D.Colorful Sea Animals

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