选择性必修第三册 Unit 9 Human Biology-【创新教程】2024高考英语总复习大一轮课时作业word（新教材，北师大版）

UNIT 9 　HUMAN BIOLOGY　[对应学生课时P264] Ⅰ.阅读理解 If you've ever felt like throwing up at the back of a bus or weak and unsteady after a boat cruise, you've experienced motion sickness. Its common symptoms are dizziness, headaches, sweating and throwing up. According to Fred Mast, a medical professor at the University of Bern, human­made acceleration creates a disturbance between our vestibular system, which is responsible for controlling balance, and our vision. Since the human brain hasn't evolved enough yet to settle that conflict, it leads to motion sickness and it doesn't take a lot of speed to cause the disturbance. Motion sickness can also strike when there is unreal acceleration, such as in three­dimensional video games or some movie scenes that make the viewers' brain think it's moving. One in three people experience motion sickness at some time. Certain_people_are_more_susceptible_to_it. These include: children, young adults and pregnant women. About seven in ten of them tend to suffer. The good news is that motion sickness is not a symptom of anything more serious. Once the motion or sensation of motion stops, it goes away. Sufferers can avoid motion sickness by making changes to how they travel. Sitting facing forward in the front of a bus allows you to see the movement, while situating yourself in the middle of a cruise liner or next to the wing of an airplane will help. Staying away from alcohol and heavy meals ahead of car, boat or plane trips also works. Access to fresh air and staring at the horizon through a window can minimize the disturbance. Antihistamines and sympathomimetics, drugs that act as stimulants, can also counteract the symptoms. Mast theorizes that motion sickness will become less strong as future generations adapt to vehicular motion－although he admits that it could take centuries and likely would only happen if our transportation systems stay the same. If speeds continue to increase, he says, “It might start all over.” 1. What do we