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
As to the lost world of Egypt, we know nearly everything ______ to know.
A．there is
B．it is
C．which is
D．what is
单项选择题
In his culture, ______ it was, this exchange of names on pieces of paper was probably a formal politeness, like saying thank you.
A．all that
B．whatever
C．whichever
D．what
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