A.symbolsB.signsC.signalsD.indications
A. symbols
B. signs
C. signals
D. indications
A.existB.isolateC.holdD.distinguish
A. exist
B. isolate
C. hold
D. distinguish
【C10】
A. evaluations
B. estimates
C. guess
D. calculations
【C11】
A. designated
B. created
C. invented
D. designed