单项选择题

Only (within) the past 200 years (scientists have) found (out what) fire (is).

A．within
B．scientists have
C．out what
D．is
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单项选择题
Neither John (and) his father was able (to wake up) (early enough) (to catch) the morning train.
A．and
B．to wake up
C．early enough
D．to catch
单项选择题
(In order to) get married in this state, one (must) present a medical report (along with) (your) identification.
A．In order to
B．must
C．along with
D．your
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