发现肺癌的最基本检查是()
A.胸部X线检查
B.痰脱落细胞学检查
C.放射性核素扫描检查
D.癌标志物检测
E.纤维支气管镜检查
参考答案:A
Over the past decades, sea ice _____ in the Arctic as a result of global warming.
A.had decreased
B.decreased
C.has been decreasing
D.is decreasing
内焰