题目

Knowing the meaning of a word is one thing; yet using it both grammatically and communicatively properly is quite ______． A．much                B．another         C．little          D．many 答案：B 一杯开水，放一段时间后水的温度会降低，水的质量将________，水的内能将________(均选填“减小”、“不变”或“增大”)，这是通过____________的方式来改变水的内能．