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30.What suggestion does the author give on escaping from a rip current?A.Swimming with the current.B.Avoiding swimming against the current.C.Swimming under the current.daod 1so003 Jo omsemiD.Avoiding floating with the current.31.Why are rip currents important to the ocean ecology?A.They redistribute small marine organisms.ovol noavzo boold sd.AB.They provide habitats for marine organisms.oave ybod 1o vilids od zwode .8C.They change the structure of marine ecosystems.D.They bring nutrients from the ocean's bottom to the surface.9q2901o01.0atimil od z'jedWDUsing the health records of more than a million Swedish conscripts(应征入伍者)，a recentstudy revealed that keeping cardiorespiratory()fitness in their late teens and earlytwenties can cut the risk of developing nine types of cancer by 40%when older.The researchteam from the University of Gothenburg,Sweden said,"These results could be used to furtherstrengthen the promotion of interventions aimed at increasing fitness in youth.Almost a third of people aged from 16 to 24 in England aren't physically active,withoutmeeting guidelines of at least 150 minutes of moderate physical activity a week includingwalking,riding a bike and dancing.dlesd wCardiorespiratory fitness(CRF)measures how well the heart,lungs and linked systemswork to get oxygen to muscles during constant activities.The conscripts,aged between 16 and25,had tests of CRF on exercise bikes between 1968 and 2005.The researchers used Swedishhealth data to see who went on to have cancer during an average follow-up of 33 years.Thestudy found that increasing fitness was beneficial,regardless of body weight.However,theyalso found that higher fitness was linked to a higher risk of skin cancer.The researchersexplained that this trend might be driven by exposure to sunlight.Findings from those observational studies provide much evidence for a link betweenhigher levels of physical activity and a lower risk of cancer.However,these studies cannotfully rule out the possibility that active people have lower cancer risk because they engage inother lifestyle behaviors.The researchers cautioned that they had no access to full data onfactors such as diet,alcohol intake and smoking and so couldn't fully account for those.Dr Claire Knight,of Cancer Research UK,said,"The NHS recommends 150 minutes ofactivity a week,but it's fine to build up activity over time and there are lots of ways to bemore active.You don't need to run a marathon or join a gym.Anything that gets you warmerand slightly out of breath and your heart beating faster counts.英语试题（长郡版）第7页（共12页）