Questions 15-17 Choose the appropriate letters A-D and write them in boxes 15-17 on your answer sheet. *

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问题 Questions 15-17
Choose the appropriate letters A-D and write them in boxes 15-17 on your answer sheet.

*

选项 A、inhibits the flow of oxygen to the heart.
B、increases absorption of other smoke particles.
C、inhibits red blood cell formation.
D、promotes nicotine absorption.