单项选择题

Each plant and animal by natural tendency, ______ far more seeds and eggs and seedlings and young, than is necessary to maintain ______ population.

A．is to produce ... their
B．produces ... its
C．produces their
D．produce... their
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单项选择题
Five score years ago, a great American, ______ symbolic shadow we stand, signed the Emancipation Proclamation.
A．with his
B．in whose
C．by him
D．of whom
单项选择题
Agriculture was a step in human progress ______ subsequently there was nothing comparable until our own machine age.
A．to which
B．signal
C．from which
D．in which
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