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
The word groundbreaking (Line 3, Para. 5) can be best replaced by _______.
A．pioneering
B．evolutionary
C．unimaginable
D．epoch-making
单项选择题
According to Professor Kraemer, the main problem in cloning pandas would be the lack of_______.
A．host animals
B．funds
C．available panda eggs
D．qualified researchers
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