单项选择题

A．appearance
B．framework
C．outlook
D．structure
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单项选择题
The period during (when) people (learned to) smelt iron is (called) (the) Iron Age.
A．when
B．learned to
C．called
D．the
单项选择题
He (is) proud (to have) never been (beaten) at (chess).
A．is
B．to have
C．beaten
D．chess
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