综合机械化采煤工作面，照明灯间距不得大于（）
A、10m
B、15m
C、18m
参考答案：B
All the students in our class are working hard every day, which ___ to be a good result in the coming 2012 NMET.
A expects B. promises C. supposes D. thinks
大众传播的多种功能是（）的具体体现。
A.一构多功
B.多构一功
C.同功异构
D.同构异功
