登山时喝空矿泉水瓶,拧紧瓶盖。下山后瓶子变瘪,瓶内的气体分子( )
A:个数减少
B:质量减小
C:间隔减小
D:体积减小
The government has decided ____ (increase) salaries for all civil servants.
连词成句。