Effective speakers are able to make appropriate speaking choices unconsciously, almost without

This device, by electronic circuitry, will produce a pure wave:

A. tuning fork B. tone generator C. oscilloscope D. both A & B E. both B & C

In an outline, you can see that two subpoints have the same level of subordination because they are arranged to

A. appear across from each other. B. use different indentation patterns. C. oppose each other. D. align with each other.