2.C解析:本题考查二力平衡。直升机沿虚线方向斜向上匀速飞行,其所受合力为零,直升机受到竖直向下的力及空气作用力两个力,根据二力平衡的条件,空气对其作用力应竖直向上,C项正确。
第二节One possible versionWhen I looked up, I saw almost the entire crowded rink staring down at me. I wasso embarrassed that I wanted to disappear by all means. My head ached and I could already feel a big laugh over my unskilled skating. The next thing I knew was that one ofthe rink workers picked me up and brought me inside. He handed me an ice pack andhad me lie down. I looked over at Jillian and read a sympathetic look on her face, but Iknew she was somewhat smiling inside. I had finally shut upLooking back to this moment, I see that being overconfident gets you nowhere inlife. I can see why Jillian was so annoyed and I honestly couldnt blame her. I now believe that being humble is one of the most important qualities someone can have andnothing good can come from being overconfident. I have certainly learned such a valuable but simple lesson that I will always carry it with me and never forget it.
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