問題詳情

It goes without saying that some contact sports are especially brutaland can cause serious head injuries. In fact, the sport of boxingtraditionally has as the ultimate goal of a prize fight a “knockout”, whichis when one fighter is punched in the head so hard that it brings about aconcussion. Other sports, such as hockey and American football, alsosee their fair share of head injuries, and in some ways, these injuries canbe even more dangerous over the long term.In both hockey and American football, players wear helmets toprotect their heads. While the helmets may protect well against bonefractures of the skull, they do not and cannot fully protect the brain. Thisorgan is made up of very delicate tissue, making any trauma to itserious.To understand why a concussion occurs is a matter of physics. Onemust remember that the brain is encased in the skull, and in between thebrain and the skull is fluid that acts as a cushion. When the force of a hitto the head is so extreme, this cushion is unable to do its job, and thedelicate tissue of the brain actually hits the skull. This causes bruising onthe brain, often causing immediate consequences that are easy torecognize. A person who is concussed will be disoriented, often unableto answer simple questions such as, “Where are you right now?” In themost extreme cases, the person suffering a concussion will becompletely knocked out, meaning he has lost consciousness altogether.
47. What is the main topic of this article?
(A) A type of head trauma caused by certain sports.
(B) The results of study done on concussions.
(C) Ways to reduce brain injuries in professional sports players.
(D) The way disoriented sports players conduct themselves.

參考答案

答案：A
難度：適中0.632911
統計：A(50),B(6),C(16),D(5),E(0)

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