若使命令按钮不可见，可以设置Visible属性的值为（）。
A.False
B.True
C.T
D.F
参考答案：A
You can't be ______ when you camp _____ an high altitude, where the air is thin. [ ]
A. enough careful; at
B. too careful; at
C. careful enough; on
D. too careful; on
幼儿园家长工作的途径和方式有什么？
