Animal Congregation

　　Many types of animals combine the advantages of family association with those

　　conferred by membership in still larger groups. Bees congregate in hives; some fish move

　　in schools; ants gather in mounds; wolves live in packs; deer associate in herds. The main

　　Line advantage of membership in a mass community is the safety that it provides. A large group

　　(5) of prey may be easier for a predator to find at any given point than is a small one, and

　　a predator may think twice before taking on such a group; if a predator does decide to

　　challenge a large group, it may merely encounter a confusing mass of moving bodies and

　　possibly may not succeed in its primary goal.

　　1. The word those in the passage refers to

　　(A) types

　　(B) animals

　　(C) advantages

　　(D) groups

　　2. The word it in line 4 refers to

　　(A) advantage

　　(B) membership

　　(C) community

　　(D) safety

　　3. The word one in the passage refers to

　　(A) group

　　(B) prey

　　(C) predator

　　(D) point

　　4. The word it in line 7 refers to

　　(A) predator

　　(B) group

　　(C) mass

　　(D) goal

　　参考答案：

　　1-4：C、B、A、A