There are no_1(bone) in the back of elephants' feet-only fat.

题干

There are no____ (bone) in the back of elephants' feet-only fat.

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bones

Endangered Wild Animals in China

Picture	Name	Main	Type	Living Area	The Number of Survivors
	Giant Panda	Bamboo	Mammal	Sichuan, Shanxi and Gansu Province	Fewer than 1,000
	Yangtze River Dolphin	Fish, shrimp	Mammal	Yangtze River	About 20-30
	Chinese Alligator	Frog, mussel	Reptile	Yangtze River	About 10
	Chinese Tiger	Meat	Mammal	In the East, Central, South and Southwest	About 20

Word Box: endangered 濒危 survivors 幸存者 giant 巨大的 mammal 哺乳动物 alligator 扬子鳄 mussel 河蚌 reptile 爬行动物

根据表格所提供的信息选择最佳答案。