____is known to all, good friends _________ happiness and value to life.

A．It; add

B．As; add

C．It; add up

D．As; add to

患者，男，56岁。肥胖，无“三多一少”症状，尿糖阳性，空腹血糖正常。为明确诊断，应做的检查是

A．空腹尿糖测定

B．餐后2小时尿糖测定

C．血脂

D．空腹血糖

E．糖耐量试验