声音简介
文章:You look up. You see something in the sky. Is it a bird or an airplane? Evenfrom faraway, you can tell the difference. Birds are much smaller than planes.
Both birds and planes have wings. Birds have two wings. The wings havefeathers. Birds flap (拍打) their wings to fly.Most airplanes have two wings too. But unlikea bird's wings, an airplane's wings do not flap.They are hard metal.
Birds fly to get from place to place. Airplanescarry people and goods from place to place.Birds are living animals, but airplanes are nonliving machines.
Airplanes and birds are alike in some ways. They are different in someways. Which do you like better?
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