45.       (45)     に入る最も適当な語を一つ選びなさい。 (A) 人間 (B) 度合 (C) 注文 (D) 人数

2. Your vessel is proceeding along a narrow channel and hears the signal “two prolonged and two short blasts” from astern How should your vessel respond if in agreement of overtaking? (A) Sound one prolonged, one short, one prolonged, one short blast (B) Sound two prolonged, two short blasts (C) Sound two prolonged, one short blast (D) Sound one prolonged, two short blasts