Helen got up too late this morning, so she went to school _____ breakfast.

A．without

B．through

C．for

D．with

疑侵蚀性葡萄胎或绒毛膜癌肺转移的常规检查是（）.

A.胸腔镜检查

B.X线胸部透视

C.X线胸部摄片

D.支气管镜检查

E.痰液β-HCG检测