25. The word "it" in line 16 refers to (A) understanding (B) public awareness (C) scientific knowledge (D) expansion

24. The understanding of research and development in the late nineteenth century is based on which of the following? (A) Engineering science is not very important. (B) Fundamental science naturally leads to economic benefits. (C) The relationship between research and development should be criticized. (D) Industrial needs should determine what areas fundamental science focuses on.