A:迎面走来的行人
B:路旁的树木
C:小红骑的自行车
D:从身边超越的汽车
① Look at the pigs. ____ A. Baa…baa…!
② It’s a white sheep. ____ B. Moo…moo…!
③ I can hear a horse. ____ C. Oink…oink…!
④ I have a duck. ____ D. Neigh…neigh…!
⑤ I can see a cow. ____ E. Ouack…quack…!