the front of their bodies,their heads and theirlegs are black,

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• the front of their bodies,their heads and theirlegs are black,
• the front of their bodies,their heads and theirlegs are black,
• the front of their bodies,their heads and theirlegs are black,
• the front of their bodies,their heads and theirlegs are black,
• the young parents were worried because of the ____(lose)of their son
• Because their head are far from their bodies.head不可数么?为什么不加s?如果不可数,又为什么用are?