9.washed 10.drinking 11.returning 12.being bossy 13.to fall 14.putting 4.VOA News When Michael Phelps is out of the water,he towers over mere non-0lympic mortals. Then he slips into the pool,and makes 1) _speed seem effortless.His height,it turns out,is no accident.According to research published in The Journal of Experimental Biology,winning athletes are getting taller,more slender,and yet heavier 2) the normal population. Since 1900,the average person's height has gone up by about two inches.But winning swimmers are four and a half inches taller than their old-time 3)_ Researchers applied mathematical models of animal locomotion to show why height gives them a competitive 4) Coaches have said in the past that swimmers should lift their bodies out of the water because air has less 5) _But researchers showed that larger bodies fall faster and more forward in the water and create a larger 6) 、 that helps push them ahead. The authors suggest that in the future we might need 7). for all sorts of sports,not just boxing or wrestling.That might give one of the shorter guys a chance to win an 0lympic swimming event even with Michael Phelps in the race. Key: 1.record-breaking 2.in comparison to 3.counterparts 4.advantage 5.drag 6.wave 7.weight classes9. washed 10. drinking 11. returning 12. being bossy 13. to fall 14. putting 4. VOA News When Michael Phelps is out of the water, he towers over mere non-Olympic mortals. Then he slips into the pool, and makes 1)____________ speed seem effortless. His height, it turns out, is no accident. According to research published in The Journal of Experimental Biology, winning athletes are getting taller, more slender, and yet heavier 2)_______________ the normal population. Since 1900, the average person’s height has gone up by about two inches. But winning swimmers are four and a half inches taller than their old-time 3)_____________. Researchers applied mathematical models of animal locomotion to show why height gives them a competitive 4)________________. Coaches have said in the past that swimmers should lift their bodies out of the water because air has less 5)______________. But researchers showed that larger bodies fall faster and more forward in the water and create a larger 6) ___________ that helps push them ahead. The authors suggest that in the future we might need 7)______________ for all sorts of sports, not just boxing or wrestling. That might give one of the shorter guys a chance to win an Olympic swimming event even with Michael Phelps in the race. Key: 1. record-breaking 2. in comparison to 3. counterparts 4. advantage 5. drag 6. wave 7. weight classes