《2025年玩转全课程八年级英语全一册人教版》

Polar bears are good at 1. swimming, but they prefer to stay on top of the ice. They mainly eat seals, which can be hard to catch. Fortunately, polar bears' white coloring helps them 2. hide in the icy surroundings. However, polar bears' hairs aren't actually white. Their long outer hairs are mostly hollow and transparent. The air spaces in the hairs scatter 3. light of all colors. Therefore, we look at polar bears and see the color white.
Some scientists believe the polar bear was once a close 4. relative to the brown bear. They think that, over time, polar bears moved to the Arctic. There, they 5. adapted to their surroundings slowly.

答案： 1. swimming
2. hide
3. light
4. relative
5. adapted