某工地要使用42.5级普通水泥，试验室取样对该水泥进行了检测，试验结果如表。42.5普通水泥的强度标准为：3d的抗折强度不得小于3.5MPa、抗压强度不得小于16.0MPa；28d的抗折强度不得小于6.5MPa、抗压强度不得小于42.5MPa。试分析该水泥强度是否合格。42.5普通水泥的强度试验结果抗折强度（MPa）抗压强度破坏荷载（KN）3d28d3d28d4.47.023.271.228.975.53.86.52970.328.467.63.66.826.569.426.568.8

A. a相超前b相
B. b相超前a相
C. c相超前b相
D. 相拉相同

A. Because water comes to them every day.
Because water is easy to use in their homes.
C. Because they can't live for a day without water.
D. Because they have to walk far to get water every day.

A. It is a place high up the mountain.
B. It is a place not far from people's homes.
C. It is a place for people to wait for their turns to get water.
D. It is a place for people to get water three times every week.

A. Because it is their custom.
Because they can walk faster.
C. Because it is the easiest way to carry water.
D. Because they are too old to use their hands.