执行下面的程序，单击命令按钮后，窗体中的输出结果是 ______。
Private Sub Cotomand1_Click()
Ch$="Welcome Home!"
a=Len(ch$)
For i= 1 To a
b$ = Mid(ch$， i 1)
If b$ = "m" Then m = m + 1
Next 1
Print m
End Sub
A．2
B．3
C．1
D．0
参考答案：A
解析： 题中程序的功能是统计字母m在字符串“Welcome Home!”中出现的次数。程序中有两个字符串函数，Len()和Mid()。Len()函数的作用为计算字符串中字符的个数，而Mid()函数的作用为取子串。题中依次选取字符串中的字母，与字符“m”进行比较，所以答案选A。
| 阅读理解。 | ||||||||||||||
| Did you donate (捐献) anything to Sichuan? People all over China and the world are giving help to the suffering (受苦的) people there after the Wenchuan Earthquake. Zha Xiaoxu is a Junior l student from Anhui. She began to save money when she was in kindergarten (幼 儿园). Last week, she broke her piggy bank (存钱罐) open and donated all the 700 yuan to Sichuan. Han Han is one of the most popular authors (作家) among young people. Shortly after the earthquake, he rushed to Sichuan and to help as a volunteer. Pop singer Jay Chou had a concert in Chongqing on Saturday. He decided to give all the ticket money to Sichuan. Chou has already donated 500,000 yuan to the quake areas. Foreign rescuers (救援人员) from Japan, Russia, the Republic of Korea and Singapore are in Sichuan to help. Now more foreign doctors are on their way to Sichuan to look after the injured (受伤的) people. | ||||||||||||||
|