Do you realize that every time you take a step, the bones in your hip are s______ to forces between four and five times your body weight. 每次你迈出一步,你臀部的骨头受到的你体重的四到五倍,你意识到了吗?
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举一反三
【单选题】若 a 的值为 3 时,下列程序段被执行后, c 的值是多少? if ( a>0 ) if ( a>3 ) c = 2; else c = 3; else c = 4;