Experts removed a layer of eighteenth-century red paint from a figure in a painting by a sixteenth-century Italian artist, revealing a layer of green paint underneath. Since the green paint dates from the sixteenth century, the figure must have been green, not red, when the painting was completed in 1563.
Which of the following, if true, most seriously weakens the argument

A．The experts had been commissioned to restore the painting to the colors it had when it was completed.

B．X-rays reveal an additional layer of paint beneath the green paint on the figure.

C．Chemical analyses were used to determine the ages of the red paint and the green paint.

D．The red paint was added in the eighteenth century in an attempt to repair damage done in the late seventeenth century.

E．(E) Red paint on the robe of another figure in the painting dates from the sixteenth century.

全身麻醉下产生高血压的原因（）

A.动脉血氧分压过低

B.血容量不足

C.术中的牵拉反应

D.二氧化碳蓄积

E.复合麻醉