口服给药受首过效应影响，生物利用度仅50%的药物是E．
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听力原文：M: The school's English club is having a party on Saturday night. Can you come？
W: I would like to, but I work at a restaurant on weekends.
Q: Why can't the woman go to the party？
(14)
A. Because she has got an appointment.
Because she has to go to school.
C. Because she has to work.
D. Because she wants to eat in a new restaurant.
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