A.by making things still |
B.by making things vibrate |
C.by making things jump up and down |
D.by changing the positions of things |
A.they can wake people up |
B.they can warn people to be careful when they are crossing the road |
C.they make it possible for people to talk or listen to each other |
D.a(chǎn)ll of the above |
A.vibrate | B.breathe the air |
C.talk to each other | D.move forward and backward |
A.different sounds have different vibrations |
B.different sounds have different sound waves |
C.different sounds have different vocal cords |
D.both A and B |
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