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
The chair was a movable wonder, he loved the feeling of power and strength it gave him for so little ______.
A．efforts
B．challenge
C．exchange
D．exertion
单项选择题
Concern over the economic situation was ______ in the government budget.
A．devoted to
B．reflected on
C．laid to rest
D．confronted with
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