2023届炎德英才大联考雅礼中学高三月考试卷(六)生物答案

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【答案】D【解析】双曲线的实半轴长为a=2,右焦点为F2(3,0),所以|MD|一MF,|=MD一(|MF2十2a)=(MD|-MF2|)-2a≤|F2D一2a=√(3-3)2+(1-0)2-4=-3，当且仅当M,F2,D三点共线时取等号.

Bales was torn between following the tracks and returning directly.If she chose to follow the tracks,she'dadd time and risk to her hiking.But the tracks ahead suggested someone might be in danger.She couldn't let thisgo.She called out into the frozen fog,"Is anybody out there?Do you need help?"The strong winds carried hervoice away.Then she walked cautiously in the direction of the tracks.She rounded a corner and spotted a mansitting motionlessly.Her searching now turned into rescuing the man.She approached him instantly and found he was sufferingfrom frostbite on his feet.Without any hesitation,she covered his body with warm clothes,and then poured himsome sugary drink.The wind roared over and they would die soon if they didn't get out of there.She supportedthe man and inched along the trail.With great efforts,Bales managed to save the man's life.Exhausted,she feltthat it was all worth it.