提高企业营业利润的方式可以通过（）。
A.增加营业外收入
B.降低营业外支出
C.降低所得税
D.增加销售收入
参考答案：D
氢化可的松的适应证有（）。
A.肾上腺皮质功能减退症
B.高血压
C.系统性红斑狼疮
D.重症哮喘
E.急性中毒性感染
— He didn't go to bed last night until 12 o'clock last night.
— Yes. He ______ his experiment over and over, working till midnight. [ ]
A. played
B. showed
C. acted
D. performed
