【单选题】Among the four maxims introduced by Grice, which one means that in conversation we should be as informative as required?
【简答题】Quick delivery is one of the advantage of airfreight service,which means a saving of time spent on transit.
【简答题】Which one means 'Don't park your cars' in the following pictures? [ ] A B C D
【单选题】which one means which?