3. Which of the following is NOT mentioned as a reason for businesses to switch to VoIP?
A. Increased productivity.
B. Lower start-up and maintenance costs.
C. Better and more unique features.
D. It can be easily set up.
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4. What equipment is needed for the setup of VoIP?
A. Phones and printers.
B. Computers with Internet connection.
C. Phones, printers, and fax machines.
D. Phones and computers with Internet connection.
5. Which of the following is closest in meaning to “hassle-free”?
A situation in which people enjoy much freedom.
B. People can express their anger freely.
C. Without involving many problems and much effort.
D. People don’t have to be disturbed by after-sales service.
以下对指针说法错误的是（）。
A. 指针变量中存放的是地址。
B. 通过指针变量中的地址，可以间接访问指针所指向的变量值。
C. 可以将指针变量初始化为一个空指针。
D. 可以用非0数值作为指针变量的初值
以下对于*p++说法正确的是( )。
A. 表示p指针先自加一,再间接访问p指向的变量值。
B. 表示先取出p指向的变量值，然后变量值自加1。
C. 表示指针变量p中的地址加1。
D. 表示指针p和p指向的变量同时加1
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