B．We are now very much aware of animal languages．
C．Most of animals use their facial expressions．
D．All animals make sounds to communicate with each other．
14．What means of communication is used by most people？
A．Facial expressions．B．Body movements．
C．Speech D．Body movement and speech，
15．We can infer from the passage that the oldest form of communicati between people is___
A.speech B．touch and hearing
C.sounds D.body language
Questions 21-25 are based on the following passage：
Promptness is important in American business，academic，and social settings．The importance of punctuality is taught to young children in school.Tardy slips and the use of bells signal to the child that punctuality and time itself are to be respected．
People who keep appointments are considered dependable.If people are late to job interviews,appointments,or classes,they are often viewed as unreliable and irresponsible.In the business world,”time is money”and companies may fine their executives for tardiness to business meeting.Of course,it is not always possible to be punctual.Social and business etiquette also provides for late arrivals.Calling on the telephone if one is going to be more than a few minutes late for schedule appointments is considered polite and is often expected.Keeping a date of a friend waiting beyond ten to twenty minutes is acceptable.
21．The best title for the passage is___
A．Punctuality
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