要使菜单项MenuOne在程序运行时失效，使用的语句是( )。
A．MenuOnVisible=True
B．MenuOnVisible=False
C．MenuOnEnabled=True
D．MenuOnEnabled=False
参考答案：D
解析： Enabled属性用来，设置一个窗体或控件是否能够对用户产生的事件作出反应，设为False时，菜单项在程序运行时失效，不响应用户的操作；设为True时，菜单项在程序运行时有效，能响应用户的操作。Visible属性用来设置窗体或控件是否可见，设为False时，控件不可见；设为True时，控件可见。
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| We have a big playground in our school. We all like to 1 games 2 after school. It's Friday. We have only two classes 3 the afternoon. When school is 4 , a lot of students go to the playground. Look! The boy of Grade Two are 5 a basketball match. Some girls are 6 and shouting ( 大叫 ). Football is our favorite sport. Many teachers are also 7 football. Li Ming, Li Lei and Wei Fang are students of Grade One. They are 8 volleyball. They are playing very 9 . It's half past five now. It's time 10 home. The students all leave the playground. | |||||
| ( )1. A. do ( )2. A. there ( )3. A. on ( )4. A. beginning ( )5. A. having ( )6. A. seeing ( )7. A. playing ( )8. A. playing ( )9. A. good ( )10. A. for | B. make B .have B. in B. finish B. making B. looking B. playing the B. making B. nice B. to go | C. play C. at there C. at C. all C. playing C. watching C. play C. play C. well C. go | D. take D. at have D. over D. over D. doing D. meeting D. make D. make D. bad D. go to | ||