架空杆路与市区树木最 * * 行间距（）米。（缆线到树干的水平距离）
A.0.4
B.0.5
C.0.6
D.0.7
参考答案：B
Our computer ________ at nine this morning and we haven't been able to do anything. [ ]
A. has broken down
B. crashed
C. has gone wrong
D. was out of order
