What can we infer from the passage
A. Music is of great importance to education.
B. Children will love to go to school if teachers teach music.
C. If you are not satisfied with the product, you cannot get a refund.
D. Children will learn more about music if they listen to the CD-OMs.
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对厚度为240mm的砖墙，大梁支承处宜加设壁柱，其条件取决于大梁跨度，以下所列条件，何者是正确的( )
A. 大梁跨度为4．8m时
B. 大梁跨度等于或大于4．8m时
C. 大梁跨度等于或大于6．0m时
D. 大梁跨度为7．2m时
You can go to the exhibition （）.
A. every day from 10:30 a.m. to 5:30 p.m. all year around
B. on Sundays July and August from 10:00 a.m. to 5:30 p. m.
C. every day from 10:30 a.m. to 5:30 p.m. from March 12 to October 31
D. on weekdays from November 1 to March 11 in winter
窗体上添加有3个命令按钮，分别命名为Command1、Command2和Command3，编写Command1的单击事件过程，完成的功能为：当单击按钮Command1时，按钮 Command2可用，按钮Command3不可见。以下事件过程中正确的是( )。
A. Private Sub Command1 Click( ) Command2．Visible=True Command3．Visible=False End Sub
B. Private Sub Command1 Click( ) Command2．Enabled=True Command3．Visible=False End Sub
C. Private Sub Command1_Click( ) Command2．Enabled=True Command3．Visible=False End Sub
D. Private Sub Command1_Click( ) Command2．Visible=True Command3．Enabled=False End Sub
The person who does not pay for a public good （）.
A. keeps himself from using its benefits
B. cannot enjoy its benefits at any time
C. fails to keep its benefits from being used
D. enjoy its benefits all the same
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