按规定，200km/h及以上区段铁路局（）对接触网质量进行不少于一次动态检测。
A.每半年
B.每3个月
C.每2个月
D.每1个月
参考答案：D
______ of danger on the road at night ,the girl had to go home with a friend _______ her.
A．Being warned; accompanied
B．Having warned; accompanying
C．Warning; accompanying
D．Having been warned; accompanying
表达式Abs(-5)+Len( "ABCDE")的值是( )。
A) 5ABCDE B) -5ABCDE C) 10 D) 0
