2 . Is it true that our brain alone is responsible for human cognition(认知)? What about our body? Is it possible for thought and behavior to originate from somewhere other than our brain? Psychologists who study Embodied Cognition(EC) ask similar questions. The EC theory suggests our body is also responsible for thinking or problem-solving. More precisely, the mind shapes the body and the body shapes the mind in equal measure.

If you think about it for a moment, it makes total sense. When you smell something good or hear amusing sounds, certain emotions are awakened. Think about how newborns use their senses to understand the world around them. They don’t have emotions so much as needs—they don’t feel sad, they’re just hungry and need food. Even unborn babies can feel their mothers’ heartbeats and this has a calming effect. In the real world，they cry when they’re cold and then get hugged. That way, they start to as-sociate being warm with being loved.

Understandably, theorists have been arguing for years and still disagree on whether the brain is the nerve centre that operates the rest of the body. Older Western philosophers and mainstream language researchers believe this is fact, while EC theorises that the brain and body are working together as an organic supercomputer, processing everything and forming your reactions.

Further studies have backed up the mind-body interaction. In one experiment, test subjects(实验对象) were asked to judge people after being handed a hot or a cold drink. They all made warm evaluations when their fingertips perceived warmth rather than coolness. And it works the other way too; in another study, subjects’ fingertip temperatures were measured after being“included” in or “rejected” from a group task. Those who were included felt physically warmer.

For further proof, we can look at the metaphors(比喻说法) that we use without even thinking. A kind and sympathetic person is frequently referred to as one with a soft heart and someone who is very strong and calm in difficult situations is often described as solid as a rock. And this kind of metaphorical use is common across languages.

Now that you have the knowledge of mind-body interaction, why not use it? If you’re having a bad day,a warm cup of tea will give you a flash of pleasure. If you know you’re physically cold, warm up before making any interpersonal decisions.

5 . The United States rose to global power on the strength of its technology, and the lifeblood that technology has long been electricity. By providing long-distance communication and energy, electricity created the modern world. Yet properly understood, the age of electricity is merely the second stage in the age of steam, which began a century earlier.

"It is curious that no one has put together a history of both the steam and electric revolutions." writes Maury Klein in his book The Power Makers, Steam, Electricity, and the Men Invented Modern America. Klein, a noted historian of technology, spins a narrative so lively that at times it reads like a novel.

The story begins in the last years of the 18th century in Scotland, where Watt perfected "the machine that changed the world". Klein writes, "America did not invent the steam engine, but once they grasped its passwords they put it to more uses than anyone else. "

Meanwhile, over the course of 19th century, electricity went from mere curiosity to a basic necessity. Morse invented a code for sending messages over an electromagnetic circuit. Bell then gave the telegraph a voice. Edison perfected an incandescent bulls that brought electric light into the American home.

Most importantly, Edison realized that success depended on mass electrification, which he showed in New York City. With help from Tesla, Westinghouse's firm developed a system using alternating current, which soon became the major forms of power delivery.

To frame his story, Klein creates the character of Ned, a fictional witness to the progress brought about by the steams and electric revolutions in America during one man's lifetime. It's a technique that helps turn a long narrative into an interesting one.

10 . My mother is 92. Unless I have to be out of town, each week I take my mother to do her _______ and visit the doctor, providing _______ and transportation. During the week, however, she likes to go to a nearby store to _______ some small things she needs.

Last week she walked up to the store, but when she went to pay for her groceries, she was _______ about three dollars. The only _______ to pay for the groceries was to take off the _______ she could do without: a bottle of rubbing alcohol (医用酒精) and a bar of soap. By taking off these, she was able to _______ the new total to the amount of cash she had with her.

At this store, people _______ and then go off to the side to _______ their own groceries. My mother was putting her groceries into shopping bags when a ________ came up to her and said, “Here are the things that you ________ .” handing her the rubbing alcohol and the ________ . My mother, who is never speechless, was speechless. She ________ for the woman’s name and address so that she could ________ her. The woman told her it was her ________ .

My mother was so ________ by her gesture that she decided to go back to the store and give the cashier (收银员) a five-dollar bill to keep on hand ________ the same happened to someone else if they didn’t have enough ________ for all of their groceries.

So, whoever you are, thank you for the random act of ________ that not only helped my mother out, but ________ too.