六级冲刺练习：阅读（68）_大学英语阅读

　　C. the diffusion of oxygen through the air sac and capillary walls into the blood

　　D. the exchange of nitrogen within air sacs

　　27. The number of times per minute that you breathe is_______.

　　A. independent of your rate of exercise

　　B. fixed at twenty-two times per minute

　　C. influenced by your age and sex

　　D. controlled automatically by an unspecified body mechanism

　　28. The process by which carbon dioxide and oxygen are transferred does not depend on

　　A. the presence of nitrogen in the blood

　　B. breathing muscles

　　C. the flow of blood

　　D. the moisture in the air sac linings

　　29. The authors style in this passage can best be described as---------.

　　A informal and matter of fact B. impersonal

　　C. personal P- matter of fact and formal

　　30. Which of the following words can replace the word exhale?

　　A. Breathe out. B. Breathe in.

　　C. Diffuse. D. Exchange.

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