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
A human quality apparently not essential in someone who works with concrete is________.
A．carefulness
B．patience
C．self-control
D．inventiveness
单项选择题
In mixing concrete, one of the desires the amateur must resist is to________.
A．break off a corner to see if the "green" has gone
B．leave the form on too long
C．strip off the forms a day after the concrete has properly hardened
D．use too much water
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