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

Professor Smith’ s new invention has created a great（）on the campus.

A. sensation
B. selection
C. imitation
D. irrigation

单项选择题

A lantern burned inside, making it ______ like the belly of a lightning bug.

A. sparkle
B. gleam
C. flicker
D. glow

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