单项选择题

In the author's opinion, what is most important in shaping a generation

A．Peace and prosperity.
B．Unfavorable conditions.
C．A world without megachanges.
D．the baby boom.
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单项选择题
By the concrete being too green , the author means that the concrete has
A．become cracked.
B．not yet cured.
C．not dried out.
D．not settled in place.
单项选择题
A human quality apparently not essential in someone who works with concrete is________.
A．carefulness
B．patience
C．self-control
D．inventiveness
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