IT CAN BE INFERRED FROM THE PASSAGE THAT THE SOUNDS PRODUCED BY THE TR...

Câu 28: It can be inferred from the passage that the sounds produced by the trees _____.

A. serve as a form of communication among trees

B. fall into the 1 –20 kilohertz range plight parched

C. are the same no matter what type of tree produces them

D. cannot be heard by the unaided human ear