单项选择题
Questions 23 to 25 are based on the conversation you have just heard.
A. Experimental medicines. B. Special treatment centers. C. Flexible work schedule. D. Innovative physical exercises.
A. Get angry. B. Look away. C. Begin crying. D. Ignore it.
A. heart rate kept steady all day B. we could attain peak efficiency at a certain time each day C. human body functioned at an unchanging rate D. body temperature had no changes all day