男性，38岁，低热，乏力2年，近半年四肢关节、肌肉酸痛，登三楼困难，同时在上眼睑出现红色皮疹，吞咽硬食困难。体检；眼睑周围水肿，眼睑、鼻梁、面颊、远端指间关节及甲词皮肤有喑紫色红斑。

为明确诊断最佳辅助检查是（）。

A.食管吞钡透视

B.皮肤狼疮带试验

C.AST和ALT检查

D.肌酸激酶

E.胃镜检查

—What time will Mr Brown be back to China?

—Sorry. I don’t know ______.

A．when did he go abroad

B．why he is going abroad

C．how soon will he be back

D．how long he is going to be there