Linda _____ the hospital to visit her uncle. She left about several minutes ago. [ ]

A. is going to

B. will go to

C. has been to

D. has gone to

患者男性，67岁，因先兆晕厥行颈动脉窦按摩检查。

颈动脉窦按摩的原理是（）

A.提高迷走神经张力，减慢窦房冲动发放频率

B.提高迷走神经张力，缩短房室结传导时间

C.提高迷走神经张力，缩短房室结不应期

D.提高交感神经张力，缩短房室结传导时间

E.提高交感神经张力，减慢窦房冲动发放频率