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.
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单项选择题
A．In developing countries.B．In industrial countries.C．In China.D．Both A and B.
A．In developing countries.
B．In industrial countries.
C．In China.
D．Both A and B.
单项选择题
A．1.B．2.C．3.D．4.
A．1.
B．2.
C．3.
D．4.
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