There are more than three________ students in our school. Look, _________ students are having a gathering on the square.

A．thousands of; hundreds of

B．thousand; hundreds of

C．thousand of; hundreds of

D．thousand of; hundred of

帕米膦酸钠的特点包括：

A．可出现肌肉酸痛

B．不产生胃肠道反应

C．可出现一过性感冒样症状

D．对骨质的吸抑制作用强

E．口服生物利用度很低