— Peter doesn't mind lending you his camera.

— He ________. I've already borrowed one.

    During the day, you spend a lot of time running, jumping, laughing, eating, and talking. You use up a lot of energy(能量), and by the end of the day you're tired. Sleep gives your body a chance to rest.

    But your brain (大脑) and body are not completely at rest during sleep. While you sleep, your mind may think of the things that happened during the day. It keeps the important things in mind as memories(记忆). It also thinks about things you were worrying about, and you may wake up with answers to some of your problems.

    You also grow while you sleep. The thing called "human growth hormone (荷尔蒙)" in the body helps you grow during sleep. This growth hormone also helps the body to repair itself.

    Sleep helps your body to conserve energy too. You use up a lot of energy during your daily activities. But when you sleep, your body temperature falls, and your "metabolism" (新陈代谢) slows down. You are still using some energy, but much less than when you are awake and active.

    Have you ever stayed up past your bedtime? Did you have difficulty getting up the next morning? Maybe you had problems seeing clearly or you cannot think clearly. That was your body's way of saying, "I need sleep!" A lack ( 缺乏) of sleep can stop your body and mind from working correctly.

下列有关细胞中化学成分的叙述，错误的是(　　)

19世纪上半期，当蒸汽机车轰鸣奔驰的时候，衣冠楚楚的绅士、淑女与衣衫褴褛的下层人民同挤一列火车，还得到处给别人让路。保守人士惊呼，铁路会带来某种“平等化的危险”。民主人士拍手称快：“我看到火车真高兴，我想封建制度是永远一去不返了。”材料主要反映了先进科技（    ）

名著阅读。
（一）那大圣飘飘荡荡，左沉不能落地，右坠不得存身。就如旋风翻败叶，流水淌残花。滚了一夜，直至天明，方才落在一座山上，双手抱住一块峰石。定性良久，仔细观看，却才认得是小须弥山。
（二）他的手在口袋里摸着勃良宁的光滑枪身，指头习惯地握住了枪柄。他慢慢地抽出手枪来，大声对自己说：“谁能想到他会有今天哪？”枪口轻蔑地对着他的眼睛。他把手枪放在膝上，狠狠地骂着说：“朋友，这是假英雄！任何一个笨蛋都会随时杀死自己！这是最怯懦也是最容易的出路！”