单项选择题

A．Depressed.
B．Ecstatic.
C．Worded.
D．Ambivalent.
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单项选择题
A．250,000.B．1 million.C．20 million.D．50 million.
A．250,000.
B．1 million.
C．20 million.
D．50 million.
单项选择题
A．Because the moon’s composition is different from Earth’s composition.B．Because the moon has almost no iron.C．Because the moon and the Earth are of similar composition.D．Because the Earth’s gravitational force is net strong enough.
A．Because the moon’s composition is different from Earth’s composition.
B．Because the moon has almost no iron.
C．Because the moon and the Earth are of similar composition.
D．Because the Earth’s gravitational force is net strong enough.
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