Scientists say they have found key clues（线索）into how long we will live. One of them is a firm __21___. British researchers believe a firm strong handshake is not just a __22___ of confidence but also an indicator of a long life. Lead author Dr Rachel Cooper of University College London said her study looked __23___ 33 different reports on the __24___ of handshakes. The research involved more than 50,000 men and women and __25___ 40 years. Dr Cooper concluded that __26___ with weaker handshakes were 70 per cent more likely to die earlier than those with the __27___ handshakes. She concludes that people with a firm strong handshake __28___ from a happy childhood that __29___ a healthy diet and __30___ of exercise. The new study, __31___ in the British Medical Journal, also found other signs of living a longer life. These 'measures of __32___ capability' include walking at a faster pace, getting out of a chair quickly, and being able to __33___ on one leg. The study showed that slow walkers were almost three times __34___ to die at a younger age than those who walked quickly and actively. Those who __35___ to get up from their armchairs were twice as likely to die earlier than those who sprang __36___ their chairs. Dr Cooper believes there __37___ more research into the link  __38___ physical capability and a long life. “Research that helps people to __39___ a long and healthy life is ever more important to help provide for an ageing __40___.” she said. 小题1: A．childhood B．relationship C．hardship D．handshake 小题2: A．sign B． symbol C．trip D．sigh 小题3: A．at B．into C．to D．on 小题4: A．strength B． length C．likeliness D．confidence 小题5: A．last B． past C．lasted D．passed 小题6: A．women B．they C．those D．men 小题7: A．weaker B．strongest C．weakest D．strong 小题8: A．must benefit B．could have lived C．should come D．may have benefited 小题9: A．concluded B． consisted C．included D．including 小题10: A．plentiful B．plenty C．a number D．the number 小题11: A．published B． being published C．publishing D．having published 小题12: A．physician B．physics C．physiology D．physical 小题13: A．stand B．balance C．live D．shake 小题14: A．likely B．likelier C．likelihood D．liking 小题15: A．wanted B． hoped C．struggled D．were dying 小题16: A．out of B． in front of C．ahead of D．away from 小题17: A．needs to be B． need to be C．ought to be D．must be 小题18: A．from B．among C．between D．beneath 小题19: A．benefit B． involve C．make D．enjoy 小题20: A．popularity B． pollution C．population D．publication