There are many k    26     of ants(蚂蚁) in America. One kind is s    27    . People are afraid of these ants, and other a    28     are afraid of them too.

These ants are often in large g    29    . They eat all the animals on their w    30    . They eat e    31    , the biggest animals on land, and they can eat houses. S    32     they can even eat people. When the ants c    33    , people leave their homes. But sometimes people are g    34     after the ants pass through, because they can see no snakes or o    35     ugly animals.

Let me tell you something about sharks. Sharks are among the oldest animals in the world. There are over four hundred and forty different kinds of sharks in the world. Whale sharks are about twelve metres long and live in the ocean.

Sharks can smell something in the water, for example, the blood of animals. That helps them find their food. Sharks mainly eat fish, other sharks and plants in the ocean.

Most sharks bite (咬) people by mistake. They think a person is a large sea animal. When the sun rises or goes down, sharks are looking for food. So at that time people shouldn’t go swimming in the ocean.

Today people kill sharks for food and their fins. The number of sharks in the world is dropping fast.