2023年八年级暑期话题阅读天天练：科普知识（含解析）

2023年八年级暑期话题阅读天天练：科普知识 （共7题） 一、阅读理解题（共7题） If you've ever stayed up late and then got up early the next day, you know what it's like not to get enough sleep. It's a very uncomfortable feeling. In fact, scientists have long believed that sleep is like food—if we don't get enough of it, we might get sick or even die. But now . Researchers at Imperial College London recently did a study on fruit flies (果蝇). They found flies that slept for very short periods of time—about 72 minutes a day—still lived about as long as flies that slept for long periods of time, according to Live Science. This has led the researchers to wonder if sleep is less necessary than we thought. Humans are very different from fruit flies. According to scientists, sleep is when our bodies grow muscle (肌肉). But can we really die from not sleeping No humans have died so far from staying awake for too long. The world record for sleeplessness is held by Randy Gardner from the US, who stayed awake for 11 days and 25 minutes in 1964. However, Gardner did experience serious side effects (副作用), such as hallucinations (幻觉), moodiness (忧郁) and memory loss. Scientists have not yet found any animals that don't sleep at all. Even animals that only sleep for short periods are not completely sleepless. This gives an idea that a minimum amount (数量) of sleep is necessary, even in short-sleeping animals. (1) In Paragraph One, the missing sentence may be _____. A．they still believe sleep is as important as food B．they believe sleep is more important than food C．they are starting to wonder why we need to sleep D．they are starting to wonder just how much sleep we need (2) What makes the researchers wonder if sleep is less necessary than we thought A．Some animals don't need to sleep at all. B．Humans are very different from fruit flies. C．Humans' illnesses have nothing to do with short time of sleep. D．Flies that sleep for a short time still live about as long as other flies. (3) What is wrong about Randy Gardner in Paragraph Four A．He did not sleep for more than eleven days. B．He stayed awake for the longest hours in the world. C．He is an American scientist who holds a world record. D．He experienced hallucinations, moodiness and memory loss. (4) The underlined word "minimum" in Paragraph Five means _____. A．最大的 B．最小的 C．长久的 D．短暂的 (5) Where can you read this article A．A novel. B．A science magazine. C．A sports website. D．An instruction book. How do you know that autumn has arrived One way is to see that whether the colour of tree leaves changes. But why do they change their colour Plants take water from the ground through their roots. And they take a gas called carbon dioxide (二氧化碳) from the air. Then they use sunlight to turn water and carbon dioxide into a certain kind of sugar. Plants use this sugar as food for energy and for growing. The way in which plants turn water and carbon dioxide into sugar is called photosynth ... ...