6. According to the passage , the meaning of a message communicated through a pheromone may vary when the

　　(A) chemical structure of the pheromone is changed

　　(B) pheromone is excreted while other pheromones are also being excreted

　　(C) exocrine glands do not produce the pheromone

　　(D) pheromone is released near certain specific organisms

　　7. The word "detecting" in line 23 is closest in meaning to

　　(A) controlling

　　(B) storing

　　(C) questioning

　　(D) finding

　　8. According to paragraph 2, which of the following has made the study of pheromones difficult?

　　(A) Pheromones cannot be easily reproduced in chemical laboratories.

　　(B) Existing technology cannot fully explore the properties of pheromones.

　　(C) Pheromones are highly volatile.

　　(D) Pheromone signals are constantly changing.

　　9. The word "They" in line 24 refers to

　　(A) pheromones

　　(B) roles

　　(C) activities

　　(D) insects

　　10. The word "sedentary" in line 29 is closest in meaning to

　　(A) inactive

　　(B) inefficient

　　(C) unchangeable

　　(D) unbalanced

　　11. Pheromone systems are relatively complex in insects that

　　(A) also communicate using sight and sound

　　(B) live underground

　　(C) prey on other insects

　　(D) live in organized groups

　　參考答案：ABCCB ADBAAD