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、blood circulation through the body.
B、activity of other toxins in the blood.
C、formation of blood clots.
D、an increase of platelets in the blood.

答案C

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