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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I've (got) five brothers, each of (them) is quite different (from) (the others).
A．got
B．them
C．from
D．the others
单项选择题
He is weak in grammar and sometimes can't even ______ a verb from a noun.
A．say
B．tell
C．speak
D．express
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