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.
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单项选择题
To drive his point home, the author________.
A．gives a lot examples of the adversity
B．uses an inductive approach
C．describes the favorable conditions in detail
D．explains everything in a persuasive manner
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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