Page 151 - ebook English for Tourism

134

million years ago from the brown bear, which still ekes out a marginal life along
the northern shore of the Arctic oceans. Unlike the massive polar bear, which can
grow huge on a diet of abundant seals, its ancestor in the Arctic is small, has very
lower reproductive rates, and eagerly eats almost anything that exists in its
environment.Polar bears have evolved something else that is different from their
ancestor: most polar bears don’t nesting, however all brown bears do. When grizzly
bear food is covered in snow during the winter, this species must den because there
is nothing to eat. In contrast, most polar bears have access to their food of choice
(seals) all winter long, so there is no need for them to den. The exception to this is
pregnant adult females. Pregnant female polar bears must den so that their tiny
newborn cubs are born in a warm protected environment; dens can be 38 degrees
Fahrenheit warmer than the outside temperature. The cubs would otherwise freeze
to death in the frigid temperatures of the far north.

Source : https://www.nwf.org/Educational-Resources/Wildlife-
Guide/Mammals/Polar-Bear

Questions :
1. Choose True or False next to the statements bellow:
2. Polar bears are the largest carnivorous land mammals on Earth. ( T / F )
3. Female polar bears are much larger than the males. ( T / F )
4. A newborn polar bear weighs about 1. 700 pounds. ( T / F )
5. Polar bears have a thick layer of fat below to trap heat. ( T / F )
6. Most polar bears don’t nesting, however all brown bears do. ( T / F )

Choose the best answer
1. What is the main idea of the first paragraph?
a. The polar bear evolved one to three million years ago from the brown bear
b. Polar bears are the largest carnivorous land mammals on Earth.
c. Polar bear has very lower reproductive rates
d. Polar bears have strong legs and large

2. How heavy are female polar bears ?
a. 1700 pounds
b. up to1000 pounds
c. 1.5 pounds
d. 1500 pounds

3. What does make polar bear unlike other bear species?
a. a thick layer of fat below the surface of the skin
b. their black nose
c. Their short tail
d. The webbed feet

4. Why is polar bear’s outer layer of fur is hollow and reflects light, giving the fur
a white color?
a. Because it helps to maintain the body heat.
b. Because it helps with swimming and walking on ice