Section C Lecture
16. [B] They are necessary in our lives.
17. [B] They feel too overwhelmed to deal with life's problem.
18. [A] They expand our mind.
19. [B] It came from a 3D printer.
20. [C] When she was studying at a fashion design school.
21. [C] It was hard and breakable.
22. [D] It marks a breakthrough in printing material.
23. [A] They arise from the advances in technology.
24. [D] It is intensively competitive.
25. [D] Sharing of costs with each other.