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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热门试题

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

单项选择题

From the passage we can see________.

A．early land policy was favorable for the expansion of the new nation
B．rich families moved west and bought land
C．there were no financial problems in building railroads in the middle of the 19th century
D．colleges in the original thirteen states could own land