确诊肺癌的依据是()
A.痰细胞学检查
B.咳嗽、咯血、胸闷
C.胸部X线摄片有圆形阴影
D.纤维支气管镜检查及活组织检查
E.以上均不正确
参考答案:A, D
________the American economy expanded at an annual rate of 2.5 percent in July—September, it faced a long road to recovery.
A.Since
B.If
C.While
D.When
因为1的倒数是1,所以0的倒数是0.______.