二、阅读短文，补全句子。
1. Polar bears live in the Arctic Circle, near the North .
2. Grizzly bears can be found in Asia, Europe, and America.
3. Giant pandas are because many of the forests where they live have been .

1. Pole 2. North 3. endangered; destroyed

参考译文
三 种 熊
北极熊生活在北极圈，靠近北极。北极熊是出色的游泳健将，它们的爪子短小，有助于它们在冰雪上行走。北极熊主要以海豹为食，但也捕食其他北极动物。
灰熊分布在亚洲、欧洲和北美洲。灰熊喜欢食用植物、哺乳动物和鱼类。它们奔跑速度可达每小时三十多英里。尽管灰熊体型庞大且强壮，但它们的幼兽出生时体重仅有一磅。
大熊猫生活在中国，毛色黑白相间。这种熊每天要吃掉多达三十磅的竹子。大熊猫是濒危动物，因为它们栖息的许多森林遭到了破坏。许多人都在努力保护大熊猫。
拓展空间
[讲一讲] 分析文中“Giant pandas are endangered because many of the forests where they live have been destroyed.”可知，句中where they live是由关系副词引导的定语从句，当先行词表示地点，且在定语从句中作地点状语时，常用where引导。例如：
This is the city where I was born.
这就是我出生的城市。
I first saw him in Paris, where I lived in the early sixties.
我第一次见他时是在巴黎，60年代初我住在那里。
[练一练] 从括号中选词填空。
1. This is the park （where/which）we played yesterday.
2. The area （when/where）the accident happened was closed off by the police.
3. This was the place （what/where）I hid the key.
4. It's one of the few countries （why/where）people drive on the left.

1. where 解析:这是一个定语从句,先行词是 the park,在从句 we played yesterday 中作地点状语,要用关系副词 where 来引导。
2. where
3. where
4. where