A：发声体振幅越大，音调越高
B：发声体振幅越小，音调越高
C：发声体振动频率越小，音调越高
D：发声体振动频率越大，音调越高
—The authors of computer viruses are geniuses.
—I agree，they can apply their wisdom to other net technology________human beings can benefit.
亚洲唯一的发达国家是
