RAISING HAND AND WAVING ARE OF THE _________ FORM OF COMMUNICATION

18. - ON THI TRAC NGHIEM TIENG ANH 12BAM SAT
ON THI TRAC NGHIEM TIENG ANH 12BAM SAT

18. Raising hand and waving are of the _________ form of communication.

A. uncountable B. countable C. non-verbal D. verbal