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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Which period lasted longest
A．Paleolithic
B．Ice Age
C．Mesolithic
D．Neolithic
单项选择题
We know from the passage that transformation resulting from science and technology ______.
A．has brought about many social and economic problems
B．has brought about many unsolvable social and economic problems
C．has brought about technological problems in the economic society
D．has brought about many social and economic problems for us to solve
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