单项选择题

A long time ago, at a national conference on biology, he cautiously（）his new theory of life.

A. produced
B. relieved
C. advanced
D. thrust

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单项选择题

I certainly made mistakes along the way, but even then, I found that I could their consequences and turn them into lessons from which something positive might come.（）

A. mobilize
B. specialize
C. standardize
D. minimize

单项选择题

To drop out has always been the（）of choice for people who find the world too brutal or too complex to be endured.

A. scheme
B. schedule
C. strategy
D. sketch

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