67. The experiment showed that smaller fish ____.

　　 A. fought over a feast　　　　 B. went on diet willingly

　　 C. preferred some extra food　 D. challenged the boss fish

66. The underlined words “the evicted fish" in Paragraph 3 refer to _____.

A. the fish beaten up　　　 B. the fish found out

C. the fish fattened up　　 D. the fish driven away

65. When a goby grows to within 5-10% of the size of its larger competitor, it ______.

　　 A. faces danger　　　 B. has breeding rights

　　 C. eats its competitor　　 D. leaves the group itself

9. A. Struggling　 B. Trembling　　　 　　 C. Wandering　　　　　　 D. Whispering

8. A. caught　　　　 B. searched　 　　 C. sought　　　　　　　　　 D. spotted

7. A. opened　　　　 B. rolled　　　　　　　 　　 C. sharpened　　　　　　 D. widened

6. A. broke away B. went out　 　　 C. broke up　　　　 D. turned out

5. A. smooth　　　　 B. clumsy　　 　　 C. slow　　　　　　　 D. small

4. A. spirits　　　　　 B. feelings　　 　　 C. courage　 　　 D. strength