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。