Mammals have warm blood. Mammals are covered with hair or fur. Mother mammals feed milk to their babies.
All birds have feathers. All birds have two wings. Mother birds lay eggs.
Reptiles have cold blood. All reptiles have scales. Mother reptiles lay eggs. Most reptiles have four legs. A snake is a reptile with no legs.
All insects have six legs. Mother insects lay eggs. Most insects can fly. Most insects have wings.
1．Mammals have warm blood.| A．are | B．am | C．be |
| A．about | B．in | C．of |
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