Mr Smith comes from Australia, but he has worked in China for five years. So you can talk with him ______________.

A．either in English or in Chinese

B．not in Chinese but in English

C．just in English, not in Chinese

D．neither in Chinese nor in English

痛痛病可出现（）

A.甲状腺肿大

B.牙齿釉面着色和缺损

C.皮肤色素沉着和过度角化

D.心肌损害

E.多发性病理骨折