1型糖尿病发病的根本原因是（）
A.长期大量吃糖类食品
B.过度肥胖
C.胰岛素分泌绝对不足
D.长期用糖皮质激素
E.胰岛素相对不足
参考答案：C
---- How long ____ at this job?
---- Since 1990.
A．were you employed
B．have you been employed
C．had you been employed
D．will you be employed
重庆素有“天然药库”之称，______县黄连产量居全国第一。
