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.
【小题1】What does "human growth hormone" do while people sleep?

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.

1.What does "human growth hormone" do while people sleep?

2.According to the passage, which of the following tells you need sleep?

3.What does the underlined word "conserve" mean?

4.What is this passage mainly about?

At this moment in different places of the world people are doing different things. In Beijing it's early morning. People are sleeping.
In London people are leaving work to go home. They are waiting for buses or running for trains. Some people are driving their cars. Some are having      afternoon tea at home or walking to the pubs(酒吧) to have a drink.
In Moscow(莫斯科) it's evening and people are having supper at home or in restaurants. Some are going to watch a ballet(芭蕾舞). Some are drinking in the pubs.
In Los Angeles(洛杉矶) it's morning. People are working in their offices.     Children are starting their lessons.
New York is midday now. People aren't working but having lunch. They are eating hamburgers or hot dogs and drinking coffee or Coke. Some people are seeing friends or shopping.
【小题1】When children in Los Angeles are starting their lessons, people in Beijing
are