填空题 从供选择的答案中选出应填入英语文句中()的正确的答案。
Software quality assurance is now an

• (A) sub-discipline of software engineering. As Buckly and Oston point out,
• (B) software quality assurance is likely to lead to an ultimate
• (C) of software costs. However, the major hurdle in the path of software management in this area is the lack of
• (D) software standards. The development of accepted and generally applicable standards should be one of the principal goals of
• (E) in software engineering.
  A: ① emerging ② emergent ③ engaging ④ evolve
  B: ① effective ② effortless ③ light ④ week
  C: ① balance ② growth ③ production ④ reduction
  D: ① usable ② usage ③ useless ④ useness
  E: ① management ② planning ③ production ④ research