填空题

What determines whether an animal is sleeping or just resting______.

【参考答案】

The complexity of its nervous system.
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单项选择题
A．Chicken is tasty.B．Roast beef is tasty.C．Not very satisfactory.D．Very satisfactory.
A．Chicken is tasty.
B．Roast beef is tasty.
C．Not very satisfactory.
D．Very satisfactory.
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