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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
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2023-07-08
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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、It doesn’t work as expected.
B、It can do harm to children.
C、It can find out serious injuries.
D、It can provide detailed image of the brain.
答案
B
解析
推理判断题。短文开始部分提到,当脑部受伤后,医生会要求做CT检查以检测更加严重的伤势。X线扫描可以提供大脑的详细图像。但是一项近期研究警告称,许多儿童会因此被置于不必要的辐射中。由此可以推断,做CT检查对儿童有害。
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