This kind of material can ________ heat and moisture.

A．certain gestures can be used as proof to judge whether a speaker is lying or not
B．politicians and businessmen lie more often than ordinary people
C．some gestures are proofs of lying only if they occur frequent
D．there is no simple way to judge if people tell lies or not

A．that is told to mean the opposite
B．that a liar tells unconsciously
C．that the teller tends to profit or gain some advantage from it
D．told unmaliciously to avoid offending people