单项选择题

A．In developing countries.
B．In industrial countries.
C．In China.
D．Both A and B.
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单项选择题
A．He knew this beforehand.B．He judged from time zones.C．He made such a judgment so as to Wang.D．He gave such an explanation because he analyzed the speeds of sound and electricity.
A．He knew this beforehand.
B．He judged from time zones.
C．He made such a judgment so as to Wang.
D．He gave such an explanation because he analyzed the speeds of sound and electricity.
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What is MSR I designed for
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