蝗虫身体的表面有坚硬的 ,可以 内部柔软器官,防止体内 蒸发,更好地适应陆地生活。
Along the river banks of the Amazon and the Orinoco there lives a bird that swims before it can fly, flies like a fat chicken, eats green leaves, has the stomach of a cow and has claws(爪)on its
下列关于越野滑雪比赛时运动员的内环境稳态调节的叙述中,不正确的是 A.运动员大量出汗导致血浆内抗利尿激素含量降低 B.比赛中血糖含量降低
铁道上每根钢轨长12m,若车厢的固有振动周期为0.6s,当车厢以 m/s的速度运动时,车厢振动得最厉害.
依次填入文中横线处的词语,恰当的一组是( )。 ①能源短缺,加上恶劣的自然条件,极大地 着这个小镇的经济发展。 ②最近上演的表
)阅读下面一首诗,然后回答问题。 钱塘逢康元龙① 明·谢肇淛 黄梅细雨暗江关,我入西吴君欲还。 马上相逢须尽醉,明朝知隔几重山。 【注】①钱
Most of us lead a busy life. 16_We think,“If I reached my goal,then I would be happy”,or “If I could get a better job,then I would enjoy life.” But why not enjoy life righ