单项选择题

Studies show that most adopted children want to know who their ______ parents are.

A．natural
B．first
C．primitive
D．original
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单项选择题
As a ______ president of the Fund, he closely followed its development long after his retirement.
A．former
B．formal
C．previous
D．late
单项选择题
The little boy demonstrated a remarkable ______ ability; his calculation with figures was faster and more accurate than any one of us here.
A．numeral
B．numerical
C．numerous
D．numerable
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