---Oh, your computer is so nice. ____ did you buy it?

---Thanks. I bought it in Wangfujing Dajie.

A．When

B．Where

C．Which

D．Whose

吸出试样注入与粒径级相应的盛沙杯内，（）和称量各盛沙杯内沙量。

A、晾干

B、晒干

C、风干

D、烘干