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 problem has been()my mind all day.

A. preying on
B. getting at
C. taking on
D. seeing to
单项选择题
It was a real () when Susan came back from her vacation and told us she had married a local waiter.

A. comfort
B. shock
C. attack
D. impact
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