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【单选题】
Not until I came to China ______ what kind of a country she is.A.
I knew
B.
I didn't know
C.
I did know
D.
did I know
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举一反三
【单选题】A large part of human activity,particularly in relation to the environment,is conditions or s. [ ]
A.
in response to
B.
in favor of
C.
in contrast to
D.
in excess of
【简答题】A．Part of a textbook. B．A large chart. C．A recent research. D．Part of a science fiction.