【单选题】—Are you pleased with what he has done? —Not at all. It couldn’t be _______. Why didn’t he put more effort into his work?
【单选题】可用于鉴别游离的2,6-去氧糖的试剂是( )
【简答题】'He didn't put on his trousers' showed'______”. [A] He was not calm at all [B] He wasn't nervous [C] He forgot to put on his trousers
【单选题】( ) 可用于鉴别游离的 2-去氧糖的试剂是:_________.
【单选题】可用于鉴别游离的 2,6-去氧糖的试剂是