单项选择题

Which of the following was developed earliest

A．The fish hook.
B．The first hatchet.
C．The bow and arrow.
D．Pottery.
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A．retreatB．reserveC．resortD．refuge
A．retreat
B．reserve
C．resort
D．refuge
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A．environmentB．fieldC．layerD．shell
A．environment
B．field
C．layer
D．shell
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