肋间神经痛

A．胸痛为短暂的刺痛或窜痛
B．胸痛为持久性刺痛或灼痛
C．胸痛为压榨性，服硝酸甘油数分钟缓解
D．胸痛随着呼吸而加重
E．胸痛为压榨性，口含硝酸甘油不缓解，伴血压下降

. Look! There is a whole crowd of people over there. Go and see what_____ and if it is a bargain, buy it.

A is selling   B is being sold   C has been selling     D has been sold