Question

Welcome to the Arctic f It includes the Arctic Ocean and the land near it．The Arctic is a habitat where many animals live．The walrus（海象），polar bear，snowy owl（雪鹗）and arctic fox ore a few of those animals．They have different ways to survive the cold．

Walrus

A walrus spends most of its time in the icy water．This marine animal has a thick layer of blubber（海兽脂）under its skin to keep it warm．When a walrus swims，its body works in a special way to stay warm．Blood flows away from its skin to important organs inside its body．They include the heart and brain．That keeps heat from leaving the walrus’s body，and the animal’s skin turns white．When the walrus is walrus again，its skin tunas a pink color．

Polar bear

A polar bear has special fur to keep it warm．Each hair is shaped like a straw．The shape helps direct sunlight toward the bear’s black skin The black skin collects and holds in heat．Polar bears also have a layer of blubber under their skin．

Snowy owl

How does a snowy owl stay warm? It has two layers of feathers．They cover the owl’s entire body，including its legs and feet．The bottom layer of feathers，called down，is soft．The outer layer of feathers is thick．In strong wind，the snowy owl may hide on the ground behind a pile of snow or rocks to block the wind．

Arctic fox

The arctic fox’s adaptation to its cold habitat includes a compact body with short legs，shortears，dense fur，and thickly haired feet，which protect against the cold and provide traction（摩擦）on ice．The arctic fox has short legs and short ears．Less surface area reduces heat loss Some animals in desert areas have larger ears for more surface area in order to keep cool．

1．Which of the following animals have a lot of fat?

      A．Walrus and polar bear．                    B．Walrus and arctic fox．

      C．Polar bear and snowy owl．                 D．Polar bear and arctic fox．

2．What purpose does a polar bear’s hair serve?

      A．To block the wind．                         B．To transfer heat to its body．

      C．To reduce heat loss．                          D．To store heat．

3．The arctic fox’s feet are covered with thick hair so as to        ．

      a．protect against the cold                      b．protect its skin

      c．float on ice                                         d．make it easy to walk on ice

      A．a，c                B．b，c                C．a，d                  D．e，d

4．Which of the following do you agree with according to the passage?

      A．Most Arctic animals depend on their feathers to survive the cold．

      B．There are few animals living in the Arctic．

      C．Many animals’ large ears are of no practical use．

      D．The skin color of some animals is related to their body temperature．

Answer 1

ABCD