5. child.根据后面的两叁岁可知是小孩。

4. wants.根据前面的come here及后文的句式搭配可知是want sb to do sth(想要某人做某事)。

3. talk.根据下文对他会讲会的描述和空格后的with，可知是talk with sb(同……谈话)。

2. think.根据前面的提问有首字母t可知是think，表示“有的科学家认为最聪明的动物应当是Alex”。

1. among.表示最高级的比较范围，意为“在……中”，一般用of或among， 等介词，此处已有首字母a，所以是among.

2、根据短文内容在空格处填入一个适当的单词，使短文的意思完整，需填单词的第一个字母已经给出。

　　 It is well-known that man is much cleverer than any animal. But which is the cleverest a_______(1) the animals？ Some scientists t_______(2) it should be Alex， an African grey parrot. He is unlike any other animal. He can really t_______(3) with people！

　　 When he says “come here”， he really w_______(4) someone to come up to him.“

　　 “Alex is as clever as a c_______(5) of 2 or 3 years old，” says Dr. Pepperberg. “He does not just repeat the s_______(6) he has been taught. He u_______(7) the words！”

　　 Alex can tell about 50 d_______(8) things， name 7 colours and count from 1 to 6. Is the parrot actually thinking in the w_______ (9) how man does？ Nobody can say. But the q_______ (10) is very interesting.

　　 答案与解析

　　 本文论述了非洲灰色鹦鹉被一些科学家认为是最聪明的动物。

15. on.跳舞当然是在草地上，所以用on.

14. in.表示在树上一般用介词in.注意表示在树上结的果子时又一般在on了。

13. cheaper.与形容词pleasanter并列的也一定是形容词，且为比较级，在方框中选出cheap和beautiful，根据常识应是cheaper.

12. but.前后是转折关系用but.