在图中所示的条形磁铁上下方两个圆圈内画出小磁针的指向；
Upon ______ the office, he saw the message on his desk.
A．he arrived
B．arrived at
C．arriving at
D．arriving
鼻腔和鼻窦的恶性肿瘤最常见的病理类型是（）
A.腺癌
B.鳞癌
C.未分化癌
D.黑色素瘤
E.腺样囊性癌
