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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单项选择题
What is the best alternative of the word address in the first paragraph
A．Speak.
B．Write.
C．Explanation.
D．Talk.
单项选择题
In the second paragraph, the author tells us that ______.
A．a better explanation of the great issue of our time has some advantages
B．nonspecialists can get help from studying in colleges and universities
C．education system will benefit from the research of the great issue of our time
D．all of the above
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