文档介绍：GMAT阅读攻略全真模拟练****题
Proponents of theory A dispute the assumption that a school of thousands of fish is highly visible. Expstates that which of the following is a factor that enables a schooling fish to escape predators?
(A) The tendency of fish to form compact groups
(B) The movement of other fish within the school
(C) The inability of predators to detect schools
(D) The ability of fish to hide behind one another in a school
(E) The great speed with which a school can disperse
2. According to the passage, both theory A and theory B have been developed to explain how
(A) fish hide from predators by forming schools
(B) forming schools functions to protect fish from predators
(C) schooling among fish differs from other protective behaviors
(D) small fish are able to make rapid decisions
(E) small fish are able to survive in an environment densely populated by large predators
3. According to one explanation of the “confusion effect”, a fish that swims in a school will have greater advantages for survival if it
(A) A tends to be visible for no more than 200 meters
(B) B stays near either the front or the rear of a school
(C) C is part of a small school rather than a large school
(D) D is very similar in appearance to the other fish in the school