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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单项选择题
A．A baby strollerB．A sleeping bagC．A backpackD．A tent.
A．A baby stroller
B．A sleeping bag
C．A backpack
D．A tent.
单项选择题
A．Iron.B．The Earth’s crust.C．The minerals from the Mars.D．Some unknown planet.
A．Iron.
B．The Earth’s crust.
C．The minerals from the Mars.
D．Some unknown planet.
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