【阅读选择】Rhythm in literature is a more or less regular occurrence of certain elements of writing: a word, a phrase, an idea, a sound, or a grammatical construction. We are also accustomed to this recurrence in the alternate heavy and light beats in mus

【阅读选择】Physiologically, we are rhythmical. We must eat, sleep, breathe, and play regularly to maintain good health. Emotionally we are rhythmical, too, for psychologists say that all of us feel alternate periods of relative depression and exhilaration

【阅读选择】One day a friend asked my wife Jill if I wanted a hearing aid. "He certainly does," replied Jill. After hearing about a remarkable new product, Jill finally got up the nerve to ask me if I’d ever thought about getting a hearing aid. "No way," I

【阅读选择】Calorie restriction dramatically extends the lifespan of organisms as different as worms and rodents. Whether this works in humans is still unknown partly because few people are willing to submit to such a strict diet. According to the passage,

【阅读选择】Get off to a slow start which saves your energy. Get up with a leisurely yawn and stretch. Sit on the edge of the bed a minute before putting your feet on the floor. Avoid the trouble of searching for clean clothes by laying them out the night

【阅读选择】Climate scientists are not present everywhere. Because there are so many places in the world and not enough scientists to observe all of them, they're asking for your help in observing signs of climate change across the world. The citizen scien

【阅读选择】Do you think sitting and studying all the time will improve your grades? Think again. Getting some exercise may help, too. New research with older people suggests that taking regular walks helps them pay attention better than if they didn't exe

【阅读选择】Organisms have a great variety of ways of adapting. They may adapt in their structure, function and genetics, in their development and production of the young and in other respects. An organism may create its own environment, as do warm-blooded

【阅读选择】Many researchers，whose work depends on ocean sounds object to a limit of one-hundred-twenty decibels(分贝). They say such a limit is a greater danger than they believed. They want to prevent noises from harming creatures in the ocean. According t

【阅读选择】Two thousand years ago the Chinese had already developed a working compass. A piece of lodestone(天然磁石) would be cut into the shape of a ladle(长柄勺). Placed on a stone board with a smooth surface, the lodestone would move round until the "handle"

【阅读选择】The world is not only hungry; it is also thirsty for water. This may seem strange to you, since nearly 75% of the earth’s surface is covered with water. But about 97% of this huge amount is sea-water, or salt water. Man can only drink and use t

【阅读选择】We are so used to our life on the surface of the earth that it can be quite an effort for our mind to break free of all the ideas that we take for granted. Because we can feel that things are heavy, we think of "weight" as being a fixed quality

【阅读选择】Good news for chocoholics：the treat preferred by millions all over the world is good for you, according to American researchers at the University of California．Chocolate contains substances called flavonoids(类黄酮) that can help maintain a health

【阅读选择】The ideal battery will store a lot of energy in a small package. Right now, Belcher's model battery, a metallic disk completely built by viruses, looks like a regular watch battery. But inside, its components are very small—so tiny you can only

【阅读选择】But just like your alarm clock, your internal clock can be reset. In fact, it automatically resets itself every day. How? By using the light it gets through your eyes. Scientists have known for a long time that the light of day and the dark of

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【阅读选择】Rhythm in literature is a more or less regular occurrence of certain elements of writing: a word, a phrase, an idea, a sound, or a grammatical construction. We are also accustomed to this recurrence in the alternate heavy and light beats in mus

【阅读选择】Physiologically, we are rhythmical. We must eat, sleep, breathe, and play regularly to maintain good health. Emotionally we are rhythmical, too, for psychologists say that all of us feel alternate periods of relative depression and exhilaration

【阅读选择】One day a friend asked my wife Jill if I wanted a hearing aid. "He certainly does," replied Jill. After hearing about a remarkable new product, Jill finally got up the nerve to ask me if I’d ever thought about getting a hearing aid. "No way," I

【阅读选择】Calorie restriction dramatically extends the lifespan of organisms as different as worms and rodents. Whether this works in humans is still unknown partly because few people are willing to submit to such a strict diet. According to the passage,

【阅读选择】Get off to a slow start which saves your energy. Get up with a leisurely yawn and stretch. Sit on the edge of the bed a minute before putting your feet on the floor. Avoid the trouble of searching for clean clothes by laying them out the night

【阅读选择】Climate scientists are not present everywhere. Because there are so many places in the world and not enough scientists to observe all of them, they're asking for your help in observing signs of climate change across the world. The citizen scien

【阅读选择】Do you think sitting and studying all the time will improve your grades? Think again. Getting some exercise may help, too. New research with older people suggests that taking regular walks helps them pay attention better than if they didn't exe

【阅读选择】Organisms have a great variety of ways of adapting. They may adapt in their structure, function and genetics, in their development and production of the young and in other respects. An organism may create its own environment, as do warm-blooded

【阅读选择】Many researchers，whose work depends on ocean sounds object to a limit of one-hundred-twenty decibels(分贝). They say such a limit is a greater danger than they believed. They want to prevent noises from harming creatures in the ocean. According t

【阅读选择】Two thousand years ago the Chinese had already developed a working compass. A piece of lodestone(天然磁石) would be cut into the shape of a ladle(长柄勺). Placed on a stone board with a smooth surface, the lodestone would move round until the "handle"

【阅读选择】The world is not only hungry; it is also thirsty for water. This may seem strange to you, since nearly 75% of the earth’s surface is covered with water. But about 97% of this huge amount is sea-water, or salt water. Man can only drink and use t

【阅读选择】We are so used to our life on the surface of the earth that it can be quite an effort for our mind to break free of all the ideas that we take for granted. Because we can feel that things are heavy, we think of "weight" as being a fixed quality

【阅读选择】Good news for chocoholics：the treat preferred by millions all over the world is good for you, according to American researchers at the University of California．Chocolate contains substances called flavonoids(类黄酮) that can help maintain a health

【阅读选择】The ideal battery will store a lot of energy in a small package. Right now, Belcher's model battery, a metallic disk completely built by viruses, looks like a regular watch battery. But inside, its components are very small—so tiny you can only

【阅读选择】But just like your alarm clock, your internal clock can be reset. In fact, it automatically resets itself every day. How? By using the light it gets through your eyes. Scientists have known for a long time that the light of day and the dark of