（）方法，用于程序运行时，刷新表单或控件。
参考答案：refresh
—Excuse me, I wonder if you can help me.
—Sure, ?
A．what is it
B．what is this
C．what help
D．what do you want
棉花的花瓣在开放的当天为白色，第二天变成红色？
