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[originaltext] The injury to the brain caused by a blow happens when the bra
[originaltext] The injury to the brain caused by a blow happens when the bra
游客
2023-07-08
21
管理
问题
The injury to the brain caused by a blow happens when the brain is shaken, often in a car crash or a fall or a strike to the head in sports. It can be mild, but doctors may order a CT scan to look for a more serious injury. Computed X-rays provides a detailed image of the brain. But a recent study warned that more children than necessary are being exposed to radiation this way. A national team led by two doctors at the University of California, Davis, studied hospital records from thousands of children with head injuries. They found that in many cases, the risk of developing cancer from the radiation outweighed the risk of a serious brain injury. The study found that one in five children over age two had a low risk of serious injury but received CT scans anyway. The same was true of almost one in four children under age two. The researchers have developed rules to predict if a head injury is serious enough for a scan. For children under two, doctors are advised against it if there is: normal mental activity, no swelling in the back of the head, no feeling of a broken bone in the skull, and no loss of consciousness for more than five seconds. Doctors should also consider how the child was injured and whether the parents say the child is acting normally. For patients from two to 18, the guidelines are similar—except there should be no loss of consciousness, no vomiting and no severe headache.
19. What’s the new discovery about CT scan?
20. What did the national team find after studying records about children with head injuries?
21. When can a child be given a scan?
选项
A、Many children suffer greatly from brain injury.
B、Many children are threatened by underlying cancer.
C、Children suffer more from brain injury than from cancer.
D、Children suffer more from cancer than from brain injury.
答案
D
解析
事实细节题。短文中提到,由加利福尼亚大学的两名医生领导的国家研究小组研究了数千名脑损伤儿童的医疗记录。他们发现在许多病例中,因为辐射而患癌症的风险超过了严重脑损伤的风险。
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