飞单是什么意思-及早

Unit 2
Moods, say the experts, are emotions that tend to become fixed, exerting an influence on one's outlook for hours, days or even weeks. That's fabulous if your mood is a pleasant one, but it will be a problem if you are sad, anxious,angry or lonely.
Perhaps one of the best ways to deal with such moods is to talk them mes, though, there is no one to listen.
Modern science offers an abundance of drugs to deal with bad moods. But scientists have also discovered the practicability of several non-drug approaches to release you from an unwanted mood. These can be just as useful as drugs, and have the added benefit of being healthier. So, the next time you feel out of sorts, don't head for the drug store-try the following approach.
Of all the mood-altering self-help techniques ,physical exercise seems to be the most efficient cure for a bad mood ."If you could keep up the exercise,you'd be in high spirits," says Kathryn Lance, author of Running for Health and Beauty. Obviously, physical activity is linked with mood changes.
Researchers have explained biochemical and various other changes that make exercise compare favorably to drugs as a mood-raiser. Physical exertion such as housework, however, does little help,probably because it is not intensive enough, and people usually do it unwillingly. The key is physical exercise- running, cycling, walking, swimming or other sustained activities that boost the heart rate, increase circulation and improve the body's use of oxygen. Do them for at least 20 minutes a session, three to five times a week.

Unit 4-1
We may take the invention of the toilet for granted, but it is something many of us would have a hard time learning to live without. Public sanitation systems were invented long ago, but when was the toilet invented? The story of the toilet takes us back to 1596.
The toilet was created by Sir John Harrington for his godmother, Queen Elizabeth I. Harrington called his design a "water closet", and his water closet was installed in Queen Elizabeth's castle in 1596.
The original toilet, or water closet, had a knob on a chain that had to be pulled in order for the water to be released from a bowl. Underneath the bowl, there was a basin or collection bowl that had to be emptied and cleaned often. It is not the sanitary and pleasant way for removing waste that we know of, but it paves the way for later improvements.
Over time, many inventors improved Harrington's original water closet by improving the pipes that were attached to the bottom and the flush system that built upon the original toilet. By 1896, Thomas Crapper began to sell toilets. Crapper saw the importance and necessity of the toilet, and he used his admiration for the product to help promote and sell the toilet.
Harrington's invention is, without a doubt, one invention that would be hard to live without. Inventors will continue to develop upon Harrington's original water closet.

Unit4-2
Scientific

文几画-避而不谈

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