Have you ever heard your own voice? "Of course," you say.
     Has anyone else ever heard your voice? Again you say, "Of course."
     But that's not quite true. Nobody else has ever heard your voice-the way you hear it. When you talk,
you set up sound waves (声波). The air outside your head carries the sound waves to your outer ears.
But, of course, the sound of your voice begins inside your head. The bones (骨头) of your head pick up
the sound waves, too. They carry the sound waves straight to your inner (里面的) ears. You get the sound
from the outside and the inside too. Other people get just the sound waves from the outside. That's why
they don't hear your voice the way you do.

1. Sound travels in the form (形式) of _____.

A. bones
B. air
C. waves
D. voice

2. The sound of your voice begins _____.

A. inside your head
B. outside your head
C. in your inner ears
D. in your outer ears

3. When you talk, other people hear your voice _____.

A. through the bones of your head
B. from the outside
C. from the inside
D. all of the above

4. The phrase "pick up" here means _____.

A. to raise
B. to get
C. to choose
D. to pull