利多卡因对哪种心律失常无效（ ）
A. 心肌梗死所致的室性心律失常
B. 强心苷中毒所致的室性心律失常
C. 心室纤颤
D. 室上性心动过速
E. 室性早搏
下列何药的肝首关消除明显,故不宜口服而常采用静脉给药（ ）
A. 普鲁卡因胺
B. 维拉帕米
C. 奎尼丁
D. 胺碘酮
E. 利多卡因
Listen to the dialogue about a school club and choose the activities mentioned in the dialogue.
A. help visitors with directions
B. clean off illegal small ads
C. help passengers at bus stops
D. promote refuse sorting
E. play with the children at an orphanage
Listen to the dialogue between Jerry and Mollie about their volunteer experiences.Andchoosewhat Jerry do as volunteers.
A. help the elderly at a nursing home
B. give directions to visitors
C. do volunteer work at the train station
D. help the elderly move around in their wheelchairs
E. chat with the elderly at a nursing home
F. carry luggage for people who need help
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