单项选择题

To what extent will future scientific discoveries make possible the ______ of human life span

A．increase
B．expansion
C．growth
D．prolongation
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单项选择题
Many theories have been ______ as to why some women suffer from depression.
A．referred to
B．put forward
C．rest assured
D．left out
单项选择题
It took him a lot of imagination to come up with such an ______ plan, a man with less intelligence wouldn't have done so.
A．artful
B．inevitable
C．optimistic
D．ingenious
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