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There are many kinds of bears. Some bears live in warm places, like sun bears. Some bears live in cold places, like polar bears. Bears are different colors, too. They can be white, brown, or black. Some bears eat plants. Some bears eat animals. Bears have long noses. They have claws and fur, too. Baby bears are called cubs. When it gets cold, bears sleep in dens for the winter. Dens can be in trees or caves. When they are sleeping all winter, it is called hibernating. Bears do not eat when they are hibernating.

根据短文内容补全句子，每空限填一词。

1.1.Sun bears live in ________ places.

解析：选warm。细节理解题。短文第二句提到“Some bears live in warm places, like sun bears.”（有些熊住在温暖的地方，比如马来熊）。因此马来熊住在“温暖”的地方，故填warm。

2.2.Bears eat ________ or animals.

解析：选plants。细节理解题。短文第七、八句说“Some bears eat plants. Some bears eat animals.”（有些熊吃植物，有些熊吃动物）。这说明熊的食物是植物或动物，故填plants。

3.3.Cubs are ________ bears.

解析：选baby。细节理解题短文倒数第五句明确写道“Baby bears are called cubs.”（熊宝宝叫作 cubs）。因此cubs就是“幼崽；宝宝”熊，故填baby。

4.4.Bears sleep in dens when it is ________.

解析：选cold。细节理解题。短文倒数第四句提到“When it gets cold, bears sleep in dens for the winter.”（当天气变冷时，熊就会在洞穴里冬眠过冬）。故填cold。

5.5.Bears eat ________ when they are sleeping all winter.

解析：选nothing。细节理解题。短文最后三句解释：“When they are sleeping all winter, it is called hibernating. Bears do not eat when they are hibernating.”（当它们睡整个冬天时，这叫作冬眠。熊冬眠时不吃东西。）既然“不吃东西”，意思就是“什么也不吃”，用nothing表达否定含义最为贴切，故填nothing。