阅读下列材料，然后从A、B、C、D四个选项中选出能回答所提问题或完成所给句子的最佳选项。B

Broadcast 1/'brɔ:dkɑ:st||ˈbrɔdˌkæst/n[C] a program on the radio or on television:a radio news  broadcast| live broadcast ( = a program that you    see or hear at the same time as the events are happening) broadcast2vpast tense and past participle, broadcast 1 [ I,T] to send out radio or television programs:The interview was broadcast live across Europe. 2 [T] to tell something to a lot of people:  There was no need to broadcast the fact that he lost his job.

Curious / ˈkjʊəriəs || 'kjur-/adj1 wanting to know about something:When I mentioned her name everyone was  curious. | [ +about]I'm incurious about this book she's  supposed to be writing.|curious to see/hear/know etc: Mandy was curious to hear what Peter had to say  himself.—opposite INCURIOUS 2 strange or unusual:a         curious noise coming from the cellar| curious thatIt's very curious that she left without saying goodbye.

Flask / flɑ:sk || flæsk/n[C] I BrE a special type  of bottle that you use to keep liquids either hot or  cold, for example when travelling 2 a flat bottle  usually used to carry alcohol 3 a glass bottle with a  narrow top, used in a LABORATORY flat1/ flæt /adjflatter, flattest 1 ▶ SURFACE◀ smooth and level, without raised or hollow areas, and not sloping or curving:a flat-bottomed boat|a perfectly flat sandy beach|

pollute / pə'lu:t/v  [T] 1 to make air, water, soil etc dangerously dirty and not suitable for people to use:  beaches polluted by raw sewage|industrial emissions  that pollute the air2 pollute sb's mind to give someone immoral thoughts and spoil their character:fears that  Lawrence's novels would pollute young minds--pollutedadj:polluted rivers--polluter n [C] pollution / pəˈlu:ʃn /n[U] 1 the process of making