单项选择题

In Kraemer's opinion, if some species died out, it would possibly______.

A．affect the existence of other species
B．do good to other species
C．reproduce the species in the future
D．clone the species right now
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单项选择题
What can we infer from the passage
A．The state should provide protection for all the old people.
B．The state has to create a suitable framework to restrict the private pensions.
C．The state should protect those who can't support themselves.
D．The state will play a secondary role in pensions due to more private pensions.
单项选择题
The word groundbreaking' (Line 3, Para. 5) can be best replaced by______.
A．pioneering
B．evolutionary
C．unimaginable
D．epoch-making
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