Though having lived abroad for years, many Chinese still_______the traditional customs.

A．participate

B．attract

C．observe

D．risk

患者，女性，23岁。淋雨后着凉，高热40℃，咳嗽，咳铁锈色痰，血白细胞和中性粒细胞均升高，X线胸片示双肺纹理增粗。以肺炎住院，医嘱青霉素皮试。

青霉素皮试最常用的部位是（）

A.腹部

B.上臂外侧

C.上臂内侧

D.前臂掌侧上段

E.前臂掌侧下段