带电作业工具使用前，仔细检查确认没有损坏、（）、变形、失灵，否则（）使用。
参考答案：受潮；禁止
— How is your mother doing? Is she _____?
— Oh, thank you. As a matter of fact, she _____. [ ]
A. looking up; has recovered
B. picking up; is already back on her feet
C. lifting up; is well again
D. taking up; has already been back on her feet
设计如图2-1所示的表单，能将输入的内容进行大小写转换，并能复原成原输入内容。
