When _______how a statue from distant Greece could have appeared in China, researchers explained that no doubt this was a result of Alexander the Great’s influence.

A．to be asked

B．asking

C．asked

D．being asked

软线摄影管电压的选择范围应是

A．25～40kV
B．45～60kV
C．65～80kV
D．85～100kV
E．105～150kV