外径48mm腕臂与（）型绝缘子配套。
（A）XP-70
（B）XP-70T
（C）QBN2-25
（D）QBN2-25D
参考答案：C
—Oxfam trailwalkers in Hong Kong have to climb________ twenty hills and mountains.
—It’s really a tough hike.
A．through
B．around
C．over
D．along
