哪些信息不可以在因特网上传输（）。
A、声音
B、图像
C、文字
D、普通信件
参考答案：D
若m、n互为相反数，则5m+5n-5的值为（ ）
A．-5
B．0
C．5
D．15
. --- What’s the matter with Jason? He looks a bit upset.
--- Didn’t you know? When returning from his holiday last night, he found his house _____.
A．broken in
B．broken into
C．broken out
D．broken down
