阅读短文，判断正误。Read the passages to see if the statements are true or false.

Polar bears are the largest meat-eating animals on land, and they are the largest of all bears. They live in the cold Arctic. They are powerful swimmers who hunt seals (海豹) in the water. Polar bears can run 40 kilometers per hour.

Polar bears live in the icy Arctic areas of Alaska, Canada, Greenland, Norway and Russia. They spend much of their time swimming in the cold seas.

Polar bears are up to 10 feet long and weigh about 1,700 pounds. Polar bears have small heads, powerful jaws and black noses. They have a strong sense of smell. They have 42 teeth and the tail is small and flat. They have wide front paws. There are small webs on their toes that help them swim. These bears swim with their front feet and steer (掌舵）with the hind feet.

Polar bears have two types of fur. They have thick, woolly fur close to the skin. Their fur keeps them warm. They also have hollow guard hairs. These hairs keep them from getting wet. Their white-looking coats camouflage (伪装）them well in the snow and ice. Under the fur， polar bears have black skin. They also have a thick layer of fat under the skin that helps keep them warm.

Polar bears are meat-eaters. They often hunt for food in the water, often many miles from land. They eat mostly seals. A polar bear's stomach can hold up to 150 pounds. Polar bears don't drink water.

【小题1】Polar bears are the largest animals on the earth.
【小题2】Polar bears like having seals as their food.
【小题3】Human beings have fewer teeth than polar bears.
【小题4】Polar bears are good at smelling.
【小题5】There are many kinds of fur on polar bears bodies.
【小题6】Without water, polar bears will die of thirst.