Please speak in a or the teacher will hear what you say.A. voiceB. whisperC. scienceD.

问题补充：

Please speak in a , or the teacher will hear what you say.

A. voice

B. whisper

C. science

D. sound

答案：

A. voice

(答案→)B. whisper

C. science

D. sound

解析：考查名词辨析：A. voice声音B. whisper低语in a whisper低声地，C. science 科学D. sound声音，句意：请小声说话，否则老师就听见你说的话了。选B。