慢性化脓性涎腺炎X线平片的主要征象是（）

A.导管局部扩张

B.导管边缘不规整

C.导管局部狭窄

D.涎石

E.导管粗细不均匀

From facts, scientists have_______ that more energy is being absorbed from the sun, throwing the earth’s energy “out of balance”.

A．confirmed

B．concluded

C．concentrated

D．centered