铝导体可作为接地极、接地母线和连接导线。（）

A client tells the nurse that she has been working hard for the last 3 months to control her type 2 (non-insulin-dependent) diabetes mellitus with diet and exercise. To determine the effectiveness of the client's efforts, the nurse should check

A．urine glucose level.

B．fasting blood glucose level.

C．serum fructosamine level.

D．glycosylated hemoglobin (Hb) level.