下列征象中，对周围型肺癌诊断价值最大的是（）
A.斑点状钙化
B.分叶及毛刺
C.空洞
D.周围无卫星灶
E.支气管气相
参考答案：B
____ the hard work of the masses ofwriters and artists, a new period of flourishing literature
andart will unfold before us. [ ]
A. Thanks to
B. Because of
C. Owing to
D. Due to
6.9-3x=1.2
（26.3-6.8-x）×3=21.6
9.5+3x=5x
13x-76+3x=76．
