单项选择题

[A] pieces [C] parts
[B] units [D] elements

A．pieces
B．units
C．parts
D．elements
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[A] environment [C] atmosphere[B] space [D] earth
A．space
B．environment [C] atmosphere
C．earth
单项选择题
[A] stars [C] earth[B] sun [D] space
A．sun
B．stars [C] earth
C．space
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