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问题 单项选择题

普通硅酸盐水泥、矿渣硅酸盐水泥、火山灰质硅酸盐水泥、粉煤灰硅酸盐水泥80μm方孔筛筛余均不得超过( )。

A．5.0%

B．8.0%

C．10.0%

D．12.0%

答案

参考答案：C

选择题

—Do you mind if I close the window?

—____．We should let in more fresh air．

A．Yes, go ahead．

B．Of course not．

C．I would like to close it．

D．I’d appreciate it if you don’t．
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选择题

We are organizing a lot of activities to celebrate the _______ birthday of the Communist Party of China these months.

A．nineteen

B．ninety

C．nineteenth

D．ninetieth
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