动物跳跃时将腿部弯曲然后伸直加速跳起．下表是袋鼠与跳蚤跳跃时的竖直高度．若不计空气阻力，则袋鼠跃起离地的瞬时速率约是跳蚤的多少倍（   ）

陶渊明不愿“为五斗米折腰”，毅然辞去在任仅八十余日的彭泽县令；李白傲睨权贵，发出“安能摧眉折腰事权贵，使我不得开心颜”的呼声，他一生狂放不羁，隐逸行乐。二人的人生价值观和处世准则明显受到（     ）

    I have a twin sister, Jenny. She has ____ (long) hair than me. Many people think we must have a lot of things in ____. That's not true. Jenny is creative. She ____ (win) the best prize in the school talent show last year. She likes making friends, but I like staying at home. So she is ____ outgoing than me. And I only can watch TV twice a week ____ I have to go to school every day. I always get better ____ (grade), but she is much ____ (little) hard-working. So maybe I should help her. ____, we also have some similarities (相似点). We ____ like sports and going shopping, so we can talk about and ____ everything with each other. I love my twin sister.