根据短文理解完成下列各题。

Do you like South Korean actor Lee Min Ho? The "flower boy" plays a cool secret agent(特工) in his new TV drama City Hunter (《城市猎人》). To play the part well, Lee did many unusual things like riding an elephant and standing on top of a big tree.

About Lee Min Ho Birthday: June 22, 1987 Height: 186cm Weight: 69kg Favourite food: meat

Favourite colors: black, white and red

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如果一个有理数的正偶次幂是非负数,那么这个数是（    ）