Do you often feel cold in winter? When you feel cold, what do you do to warm yourself up? Do you put on more clothes? When it’s cold, how do you sense that?
I like to take a bath. I like the way the warm water feels on my skin. I do not like to get out of the bathtub (浴缸). When I get out of the bathtub, I get really cold. Sometimes I am so cold that my teeth begin shaking, and I start to shiver (颤抖). Why do we shiver when we are cold?
Shivering is a reflex (反射). We don’t have to think about a reflex in order to make it happen. When the air around us suddenly becomes cooler, the nerves (神经) in our skin sense that we are cold. These nerves then send messages to our brain. The brain sends messages back that race through our bodies. These messages tell all of our muscles (肌肉) to start warming up.
Our muscles then start tightening (绷紧) and relaxing. They do this very quickly over and over again. These quick actions are the shivers. These shivers help to warm us up. So the next time you start to shiver, thank your nerves. They’re working to warm you up before you even have the chance to shout, “Mom, I’m c-c-c-old!”
【小题1】When ______, we often shiver.| A．we feel cold |
| B．we get out of the bathtub |
| C．we take a bath |
| D．our teeth begin shaking |
| A．To help us warm up when we are cold. |
| B．To help us to become brave. |
| C．To help us think about something. |
| D．To help send messages to our brain. |
| A．encourage you to take more baths |
| B．show the best way to stay warm |
| C．tell you how and why your body shivers |
| D．tell you how to stop shivering |
| A．Shiver Me! |
| B．Shivering: What a Strange Way to Warm Up! |
| C．How to Stop Shivering |
| D．Shivering is Not for the Weak |
