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
John is not (enough intelligent) (to pass) (this) (economics) class without help.
A. enough intelligent
B. to pass
C. this
D. economics
单项选择题
(Neither) rain (nor) sleet nor snow (keep) the mailman from his (appointed) rounds.
A. Neither
B. nor
C. keep
D. appointed
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