— It is important for you to find               appropriate course at college．

—I can't agree more．It's         decision that affects the whole family．

A．the, the

B．an, the

C．an, a

D．the, a

推移质测验作业由采取的推移质质量和时间及取样器的口门宽度推算出（）输沙率，并分析级配组成，进而进行断面综合计算，推算出断面输沙率。

A、全宽

B、单宽

C、全深

D、相对深