单项选择题

Overpopulation poses a terrible threat to the human race. Yet it is probably ______ a threat to the human race than environmental destruction.

A．no more
B．not more
C．even more
D．much more
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单项选择题
Linda was______the experiment a month ago but she changed her mind at the last minute.
A．to start
B．to have started
C．to be starting
D．to have been starting
单项选择题
The research requires more money than ______.
A．have been put in
B．has been put in
C．being put in
D．to be put in
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