12.A.give
B.receive
C.live
D.refuse
13.A.keep away
B.stay around
C.help out
D.go on
14.A.cooked
B.stored
C.offered
D.produced
15.A.seldom
B.even
C.once
D.never
阅读理解
Healthy knees aren,t the main consideration in choosing high heels,but new research says chunky heels are just as bad for the knees as spindly stilettos(细高跟鞋).“It takes a long time to feel the effects of knee osteoarthritis(骨关节炎)—and once you do it,it is too late,” said Dr.Casey Kerrigan,leading researcher of the study and associate professor at Harvard Medical School,s department of physical medicine.“I compare it to smoking—one cigarette is not painful,but over a lifetime it is.Wideheeled shoes feel comfortable,so women wear them all day long,” Kerrigan said.“They are better for your feet than stiletto heels,but just as bad for your knees.”
In the study,researchers had twenty women wear two pairs of shoes with three inch heels,one with a narrow heel and the other with a thick one.The scientists compared how much pressure was put on the womens knees by both types of shoes.The women also walked barefoot to test normal pressure.The scientists found that both types of shoesappliedequal amounts of pressure to the knees.Compared with walking barefoot,the heels increased pressure on the inside of the knee by 26 percent.Increased pressure on the knee eventually leads to arthritis,experts say.
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