以黑龙江为界与我国相邻的国家是（）。
A、蒙古
B、俄罗斯
C、哈萨克斯坦
D、朝鲜
参考答案：B
患者，女，30岁，胸片示右上纵隔一椭圆形阴影，其中有斑点状钙化影，透视下见块影可随吞咽上下移动，首先考虑（）
A.畸胎瘤
B.心包囊肿
C.胸内甲状腺
D.支气管囊肿
E.胸腺癌
American people were proud and optimistic because they felt they had saved the world and now were helping to rebuild Europe and Japan.
A．True
B．False
