【題目】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

【答案】B

【解析】

考查連詞辨析。句意：在森林中，聲音是最好的遠(yuǎn)距離交流方式，因為與光相比，它不會被樹木阻擋。A. while雖然，然而；B. because因為；C. when當(dāng)…時；D. though雖然，盡管。此處表示原因，故選B.

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