“We found that the climbers who fell from heights higher than 20 feet took up 70 percent of the patients treated for a rock climbing-related injury，” explained the study author Lara McKenzie，PhD，director at the Center for Injury Research and Policy at Nationwide Hospital．“This trend，combined with the fact that rock climbers have a higher hospitalization rate than other sports and recreational injuries，demonstrates the need to increase injury prevention efforts for climbers．”

　　1．Which body part is most likely to get injured for a climber?

　　A．The arm．

　　B．The ankle．

　　C．The knee．

　　D．The hand．

　　2．How many women climbers in America got injured while climbing a rock between 1991 and 2008?

　　A．About 40,000．

　　B．About 30,000．

　　C．About 20,000．

　　D．About 10,000．

　　3．The severity of climbers’ fall-related injures is mainly related to ________．

　　A．the height of the fall

　　B．the climber’s age

　　C．the climber’s health conditions

　　D．the climber’s climbing experience

　　4．The underlined word “demonstrates” in the last paragraph can be replaced by “________”．

　　A．demands

　　B．prevents

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