下列情况中，物体既具有动能又具有重力势能的是（   ）

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      As everyone knows, not o____ fast walk but also slow walk does good to the muscles and lungs of human. So people walk to build up their bodies, or to lose w____. But only some of them know that taking a walk every day is also good for p____ people's hearts. Heart attack has become the first disease in the world b____ more and more people suffer from it.

    Taking a walk can improve the blood supply to our hearts. If you try to walk as o____ as possible, you'll have a healthier heart.

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                                                                                                                                        顾和搏虱如故
        顾和^①始为扬州从事，月旦^②当朝，未入，顷停车州门外。周侯诣丞相，历和车边，和觅虱③，夷然不动。周既过，反还，指顾心曰：“此中何所有？”顾搏虱如故，徐应曰：“此中最是难测地。”周侯既入，语丞相曰：“卿州吏中有一令仆才④。”

                                                                                                                                                                                   （《世说新语•雅量》）
       【注释】①顾和：字君孝。王导任扬州刺史时，调他做从事（从事：古代官职名），后来官至尚书令。②月旦：农历每月初一。③虱：虱子，体外寄生虫。④令仆才：作尚书令和仆射的才能。