单项选择题

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

A．progress
B．extension
C．growth
D．promotion
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单项选择题
For a lack of space, I had to ______ a lot of excellent materials, which I intend to include in another book.
A．leave out
B．knock out
C．lay out
D．hold out
单项选择题
A special committee was set up to ______ the matter and report to the board of directors.
A．look for
B．look into
C．look on
D．look through
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