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
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单项选择题
He (wrote) the story, (typing) it (into) the computer and (handed) it to the chief editor.
A．wrote
B．typing
C．into
D．handed
单项选择题
I've (got) five brothers, each of (them) is quite different (from) (the others).
A．got
B．them
C．from
D．the others
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