通常情况下，用于金属网顶棚底层抹灰的砂浆为( )。
A．混合砂浆 B．聚合物水泥砂浆C．麻刀石灰砂浆 D．普通水泥砂浆
参考答案：C
The new model of car is so expensive that it is only________the reach of those with high incomes.[ ]
A. beyond
B. at
C. in
D. within
