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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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
单项选择题
Many people moved west after independence in order to________.
A．buy land at a low price
B．occupy land for family farms
C．build railroads
D．set up colleges
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