糖尿病最严重的并发症是
A．皮肤感染B．泌尿系感染C．酮症酸中毒D．低血糖E．白内障
参考答案：C
当二次电压正常，二次电流显著降低，则可能发生了（）。
—This pair of leather boots ______ nice. Can I ______?
—Certainly, Here you are. [ ]
A. look, try it on
B. look, try them on
C. looks, try it on
D. looks, try them on
