ad the instructions.
To prepare safe, usable concrete, first inspect the molds. Then pour in the cement, having first mixed in the aggregate. Check to make sure
t the mixture contains 7% water, and let the concrete harden. When the curing process is over, test the concrete for elasticity. Inflexible concrete
kes a hazardous building material, so follow these directions carefully.
ich sentence best summarizes this paragraph?
O1. The preparation of cement has several stages.
O2. Adding too much water or aggregate to the curing concrete can create a hazardous building material.
3. Concrete must be carefully poured, mixed, cured, and tested to assure a safe building material.
4. First inspect the molds before beginning to pour concrete.
