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
To qualify for such a position, the native would first have to receive specialized training, and this is ().

A. refused
B. discouraged
C. denied
D. forbidden
单项选择题
We made plans for a visit, but () difficulties with ear prevented it.

A. subordinate
B. succeed
C. successive
D. subsequent
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