题目内容
（请给出正确答案）
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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Concrete
Another thing to remember in connection with concrete is that you are not allowed very much leeway for errors in either measurements or location. Once you have a solid mass of concrete set in place, it is going to stay there. You have a difficult job ahead of you if you try to remedy a mistake. Make very sure, before you fill the form, that everything is where and how you want it.
There are numerous rules regarding the proper mixing handing, and finishing of concrete, but the essential one concerns the amount of water to use. The less water in the mix, the less the finished job will shrink. The less water used, the harder and more enduring the job after it has set.
The amateur concrete worker is plagued with two desires. One is to use enough Water to have the concrete nice and soft and easy to push around. You have been warned against that. The second is to take off the wooden forms too early, to see what the job looks like. That is really fatal. If the forms are stripped off too soon, while the concrete is still green, two things are likely to happen—you are almost sure to break off corners or edges, and you are likely to cause a major crack or defect in the body of the work. An excellent rule is to wait until you are sure the concrete is properly' hardened, and then wait another day before removing the forms.
The best title for this selection would be:________.
A．Concrete and Its Uses
B．Rules for Working with Concrete
C．Concrete, the Homeowner's Joy
D．Concrete, a Test of Character
A、mixed, don’t mix
B、mixxed, were not mixxed
C、mixed, were not mixing
D、mixxed, don’t mix
A: when to deal with a worker
B; when dealing with a worker
C; when dealt with a worker
A．they have a vision from the mountaintop
B．they have warm feelings and emotions
C．they can serve as concrete examples of noble principle
D．they can make people feel stronger and mine confident
A.Communicative
B.Authority-oriented
C.Concrete
D.Analytic
A.Software can have multiple copies. Software can have multiple copies
B.Software is a kind of concrete physical entity
C.The faults in a software system come from wearing out
D.Software is something mysterious mastered by some geniuses
