吸痰时引起低血压可能是刺激了迷走神经所致。

单项选择题Why can't they watch a movie at home in the evening?A.Because Susan's mother will not allow them to watch a moviE.B.Because Susan has to finish her history assignment.C.Because Susan has to cook for the family.D.Because Susan's video machine is broken.

单项选择题Which is the Dr. Spock's advice for raising children?A.Parents should respect their children.B.Parents should feed children on a rigid schedulE.C.Parents should break children of bad habits.D.Parents should avoid showing their children affections.