Children who suffer head trauma(创伤)call experience headaches months after the injury, with girls more likely to have them than boys，a new study finds．

　　 The researchers also found that the risk of having these headaches was greater after a mild

traumatic brain injury(TBI)than after a moderate or severe one．

　　 The study, published online Dec．5 in the journal Pediatrics，included children aged 5 to 1 7 who were hospitalized with traumatic brain injury in King County in Washington State and one in Philadelphia．Three months after treatment，headaches were reported by 43 percent of children who’had a mild TBI，37 percent of those who had a moderate to severe TBI，and 26 percent of children in a control group who’d suffered broken arms but no head trauma．

　 The researchers also assessed the children one year after they were hospitalized and didn’t find any significant differences in headaches between the groups．

　 Teens and girls appear to have the highest risk for headache after mild TBI，and the course of recovery after such events is likely affected by age，injury severity and gender(性别)，the researchers concluded．

　The authors noted that more than half a million children in the United States suffer a TBI each year．

　“Little research has focused on chronic(慢性的)headache post-TBI in children，”Dr．Heidi Blume，of me Seattle Children’S Research Institute，said in锄institute news release(发布会)．“The common existence of headache following mild TBI appear to follow a pattern we see in primary headache disorders such as a migraine(偏头痛)．”

　 She said the research will examine similarities betwe．en TBI and migraine，including a look at whether“migraine treatment will work for post．traumatic headaches．”

　 In the meantime，‘'what parents need to know is that some children with TBI may have headaches for several weeks or months after TBI，but that most recover with time，”Blume said．“And significantly, girls and teenagers appear to be at particular risk for headaches after mild TBI．Parents should be aware of what to expect after mild TBI，and that includes TBI for sports．related injuries．”，

71．Which of the following can best serve as the title of the passage?

　　　 A．Teachers Should Do More to Protect Teenagers in Schools

　　 B．How to Avoid Headaches after Traumatic Brain Injuries　

　　 C．Head Injuries May Lead to Headaches for Teenagers

　　 D．More Attention Should Be Paid to Post．TBI Headaches

72．The differences in headaches after TBI among different people lasts______.

　　　A．for more than a year　 B．1ife long 　

C．for three months D．for less than a year

73．Which of the following statements is not true according to the passage?

　　　 A．The severer the injury is．the greater the risk will be．　

　　　 B．Headaches after TBI are similar to a migraine．

　　　C．There hasn’t been enough research on headache post-TBI in children．

D．Giris are more likely to have post．TBI headaches．

74．In the last paragraph，Dr．Heidi Blume warns that________.

　　　 A．parents should look after their children more carefully

　　　B．post—TBI headaches will last for several weeks or months

　　　C. post—TBI headaches may not show immediately

　　　D．girls and teenagers should avoid attending school sport activities

75．Paragraph 3 is intended to_______.

　　　A．prove that girls are mole likely to have post—TBI headaches

　　　B．support what is mentioned in Paragraph 2

　　　C．show the common existence of headaches after TBI

　　　 D．tell the readers that post-TBI headaches are not dangerous