单项选择题

A．The origin of the Earth
B．The origin of the Moon.
C．The Earth and the Moon.
D．The Moon and the Mars.
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填空题
A happy person tends to speak in the______ voice.
单项选择题
A．He is busy all morning.B．He will give a lecture on air-conditioning.C．He cannot bear the low temperature in the auditorium.D．He likes the atmosphere in the auditorium.
A．He is busy all morning.
B．He will give a lecture on air-conditioning.
C．He cannot bear the low temperature in the auditorium.
D．He likes the atmosphere in the auditorium.
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