题目内容：

It is well-known that man is much c_________1.than any animal. But which is the cleverest a________2. the animals? Some scientists t________3. it should be Alex, an African grey parrot. He is unlike any other animal. He can really t________4. with people! When he says “come here”, he really w_____5.someone to come up to him.”  “Alex is as clever as a c_______6.of 2 or 3 years old,” says Dr. Pepperberg. “He does not just repeat（重复） the sounds he has been taught. He understands the w___7.”

Alex can tell about 50 d_______8.things, name 7 colours and count f_______9.1 to 6. “Is the parrot actually thinking in the way how man does? ”Nobody can say. But the q_______ 10. is very interesting.