系指在水中或规定的释放介质中以零级或接近零级速率释放药物的（）.
A．硬胶囊
B．软胶囊
C．缓释胶囊
D．控释胶囊
E．肠溶胶囊
参考答案：D
On a farm, there are ____________ big trees. [ ]
A. third
B. three
C. a
