2017托福100篇阅读理解试题（四十三）_第2页

　　6. The word "alert" in line 13 is closest in meaning to

　　(A) allow

　　(B) transport

　　(C) warn

　　(D) provide

　　7. What is the role of pheromones in the mass migrations of ants?

　　(A) Pheromones are used to create a trail that directs the ants during migrations.

　　(B) Pheromones signal the ants that the nest has been invaded and must be abandoned.

　　(C) Pheromones control the speed at which ants move from one location to another.

　　(D) Pheromones enable scouts to identify suitable areas for establishing a new nest.

　　8. The word "scurrying" in line 16 is closest in meaning to

　　(A) agreeing

　　(B) appearing

　　(C) competing

　　(D) rushing

　　9. The word "others" in line 21 refers to

　　(A) private messages

　　(B) species

　　(C) trails

　　(D) signals

　　10. Why does the author mention "dead insects" in line 23?

　　(A) To compare the social behaviors of ants with those of other insects

　　(B) To emphasize the dangers that all insects encounter

　　(C) To argue the superiority of ants over other insects

　　(D) To indicate a behavior that is common among various kinds of ants

　　11. Which of the following terms is defined in the passage ?

　　(A) pheromones (line 2)

　　(B) colony integrity (lines 12)

　　(C) mass migrations (line 14)

　　(D) private messages (lines 18-19)

　　参考答案：BBDCC CADBD A