【题目】In the forest, sound is the best means of communication over distance ________ in comparison with light, it won't be blocked by trees when travelling.
A. while B. because
C. when D. though
在线课程【答案】B
【解析】
考查连词辨析。句意：在森林中，声音是最好的远距离交流方式，因为与光相比，它不会被树木阻挡。A. while虽然，然而；B. because因为；C. when当…时；D. though虽然，尽管。此处表示原因，故选B.