Passage Three

Questions 18 to 20 are based on the passage you have just heard.

18. [A] How spiders gather food.

[B] Why spider webs are so strong.

[C] How spider build their webs.

[D] How new kinds of structures might be designed.

19. [A] They\'re much larger than spiders.

[B] They\'re quite delicate.

[C] They have unusual ways of gathering food.

[D] They developed a long time before spiders.

20. [A] Chemists.

[B] Architects.

[C] Airline pilots.

[D] Auto designers.