阅读短文，根据短文内容及首字母提示，在空白处填入一个适当的单词。
It is well known that man
is much cleverer than any animal. But which is the cleverest a{#blank#}1{#/blank#} the animals? Some scientists t{#blank#}2{#/blank#} it should be Alex，an
African grey parrot. He is unlike any other animal. He can really t{#blank#}3{#/blank#} with people!
When he says "come
here", he really w{#blank#}4{#/blank#} someone to come up to him.
"Alex is as clever as
a c{#blank#}5{#/blank#} of2or3yearsold," says Dr. Pepper erg. "He
does not just repeat the s{#blank#}6{#/blank#} he has been taught. He u{#blank#}7{#/blank#} the words!"
Alex can tell about 50 d{#blank#}8{#/blank#} things, name 7colours and count from 1 to 6.Is
the parrot actually thinking in the w{#blank#}9{#/blank#} man does? Nobody can say. But
the q{#blank#}10{#/blank#} is very interesting.
