— Daniel, the speech competition will begin soon. Please ________ the microphone a bit to make everyone hear more clearly.
— No problem!
A．turn onB．turn upC．turn offD．turn down
B

試題分析：turn on打開，發(fā)動；turn up發(fā)生，開大；turn off關(guān)掉，關(guān)閉；turn down減小，關(guān)低。句意：丹尼爾，演講比賽就要開始了。請把麥克風(fēng)調(diào)聲音大一點(diǎn)，以便讓每個(gè)人都能聽得更清楚一些。結(jié)合語境可知選B。
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