Little－known facts about germs

    Germs are everywhere and in so many forms.{#blank#}1{#/blank#} There are some steps you can take to help prevent the spread of germs in your personal space.

    Computer keyboards can have more germs than a public toilet.Keys and spaces on a keyboard are main breeding grounds for bacterial and viral growth.{#blank#}2{#/blank#} Clean your keyboard regularly with specialized wipes for electronics，and remove dust with an air duster.

    {#blank#}3{#/blank#} While it seems to make sense that covering your toothbrush would protect，the opposite is the case.With a cover on your brush，a more humid environment is created and more likely to encourage growth of germs.Wash your toothbrush when done，and allow it to air dry.Make sure you store it away from the toilet.

    Hand sanitizer(洗手液) does not always replace soap and water washing.Hand sanitizer is great when you're not near a sink，and need to clean your hands.But given the choice of a spritz of sanitizer or good old soap and water，choose the soap and water route.{#blank#}4{#/blank#}  Lather up and scrub hard for at least 20 seconds，and wash between your fingers and the back of your hands.Don't skimp with the hand sanitizer either—cover the same hand areas as for soap and water.

    {#blank#}5{#/blank#} If you freeze foods that you suspect might be spoiled，freezing them will not kill the germs already in the food.Freezing prevents further bacterial growth，but when you thaw it out，the bacteria continue to increase and pollute your food.

A．Freezing food does not kill germs.

B．Try not to eat outside especially in summer.

C．Exposure to germs can lead to many illnesses.

D．Toothbrush covers do not protect your brushes from bacteria.

E．There are a lot of effective ways to get rid of germs in your house.

F．Soap and water are only a better germ fighter when done properly.

G．Some reports show five times more germs on a keyboard than on a public toilet.

    Scientists have been interested for years in the observation that ratios(比率）of finger lengths differ in men and women. In men, the ring (fourth) finger is usually longer than the index (second); their so-called 2D :4D ratio is lower than 1. In females, the two fingers are more likely to be the same length. Because of this sex differences, some scientists believe that a low ratio could be a marker for higher prenatal hormone(产前激素）levels, although it's not clear how the hormone might influence finger development. The 2D : 4D ratio has also been fingered in connection with brain-related characteristics—most often in males--such as depression, left-handedness, musical ability, and homosexuality.

    In the latest such study, psychologist Mark Brosnan and colleagues at the University of Bath in the United Kingdom photocopied the hands of 74 boys and girls aged 6 and 7.They compared the measurements of the second and fourth fingers with the children's scores on a standard UK test of math and literacy. In boys, the lower the ratio, the better their math score, the team reports in the May issue of the British Journal of Psychology, The boys with the lowest ratios also were the ones whose abilities were most skewed in the direction of math rather than literacy. These differences are small but significant, says Brosnan. With the girls, there was no correlation between finger ration and numeracy, but those with higher ratios—probably indicating low hormone levels—had better scores on verbal abilities.

    These sex-specific correlations show how tricky it is to define the roles of sex hormones, says psychologist S .Marc Breedlove of Michigan State University in East Lansing. The range of normal levels of the hormone is different in males and females, so comparable levels would have very different meanings depending on the sex of the individual. And the timing of hormone surges is as important as levels.

    Nevertheless, Brosnan believes finger measurements might be useful for predicting cognitive abilities—although he acknowledges that “we are not suggesting that finger length measurements could replace SAT tests”. Others are more cautious, pointing out that scientists still have not confirmed that finger ratio is a reliable marker for prenatal hormone levels.

    Honesty is the best policy. We may agree that admitting mistakes and behaving in a genuine way is the right way to lead our lives, but is there something in our human nature that makes us immoral? For example, in some shops and car parks you can find an honesty box-a box where you pay for something by putting money in it-but it relies on you putting the right amount of cash in. This relies on people being honest and not trying to cheat but it does provide a temptation to get away with not paying the full amount.

    Philip Graves, a psychologist, suggests that this temptation is part of our evolution. He says: “We have evolved with the ability to be dishonest. It's part of our evolutionary psychological make-up-because if we can gain an advantage over the people around us, we have a greater chance of surviving.”

    So why do we place such importance on being honest if we benefit from being dishonest? It's because it is selfish behavior. If everybody acted selfishly and dishonestly all the time, the world would be a very unpleasant place. As Philip Graves says: “There is a balance to strike between the extent to which we can feather our own nest, so to speak, and the risk of being ostracized (排斥) by the group.” So, for societies to work together we need to trust each other and therefore we need to be honest.

    Being trustworthy with money is of course vital for an economy to survive. But being honest with words is another matter, saying what we think to someone can get us into hot water. However, a new anonymous messaging app has been designed that lets anyone with a link to your profile (简介) to send you a message without knowing who it's from. The app now has 300 million users which perhaps indicates how honest we really like to be-but in all honesty, do you want to know what people think about you? Is honesty always the best policy?

    I was ten when I first sat with my grandmother behind the cashier(收银台) in her grocery store. {#blank#}1{#/blank#} I quickly learned the importance of treating customers politely and saying "thank you."

    At first I was paid in candy. {#blank#}2{#/blank#} I worked every day after school, and during the summer and on weekends and holidays from 8 a.m. to 7 p.m. My father helped me set up a bank account.{#blank#}3{#/blank#}

    By the time I was 12, my grandmother thought I had done such a good job that she promoted me to selling cosmetics(化妆品). I developed the ability to look customers directly in the eye. Even though I was just a kid, women would ask me such things as "What color do you think I should wear?" I took a real interest in their questions and was able to translate what they wanted into makeup(化妆) ideas. {#blank#}4{#/blank#}

    The job taught me a valuable lesson: to be a successful salesperson, you didn't need to be a rocket scientist—you needed to be a great listener. {#blank#}5{#/blank#} Expect they are no longer women buying cosmetics from me; instead, they are kids who tell me which toys they would like to see designed and developed.

A. Later I received 50 cents an hour.

B. Before long, she let me sit there by myself.

C. I ended up selling a record amount of cosmetics.

D. Today I still carry that lesson with me: I listen to customers.

E. My grandma's trust taught me how to handle responsibility（承担责任）.

F. Soon I found myself looking more beautiful than ever before.

G. Watching my money grow was more rewarding/worthy than anything I could have bought.

    Why do some people live to be older than others? You know the standard explanations: keeping a moderate diet, engaging in regular exercise, etc. But what effect does your personality have on your longevity（长寿）? Do some kinds of personalities lead to longer lives? A new study in the Journal of the American Geriatrics Society looked at this question by examining the personality characteristics of 246 children of people who had lived to be at least 100.

    The study shows that those living the longest are more outgoing, more active and less neurotic (神经质的) than other people. Long-living women are also more likely to be sympathetic and cooperative than women with a normal life span. These findings are in agreement with what you would expect from the evolutionary theory: those who like to make friends and help others can gather enough resources to make it through tough times. Interestingly, however, other characteristics that you might consider advantageous had no impact on whether study participants were likely to live longer. Those who were more self-disciplined, for instance, were no more likely to live to be very old. Also, being open to new ideas had no relationship to long life, which might explain all those bad-tempered old people who are fixed in their ways.

    Whether you can successfully change your personality as an adult is the subject of a longstanding psychological debate. But the new paper suggests that if you want long life, you should strive to be as outgoing as possible.

    Unfortunately, another recent study shows that your mother's personality may also help determine your longevity. That study looked at nearly 28,000 Norwegian mothers and found that those moms who were more anxious, depressed and angry were more likely to feed their kids unhealthy diets. Patterns of childhood eating can be hard to break when we're adults, which may mean that kids of depressed moms end up dying younger. Personality isn't destiny, and everyone knows that individuals can learn to change. But both studies show that long life isn't just a matter of your physical health but of your mental health.

The cane toad (海蟾蜍) was imported to Australia in 1935 to protect sugarcane crops. {#blank#}1{#/blank#} Experts estimate that there are currently over 200 million samples spread across Northern Australia, and the numbers are only growing. The increasing population is proving to be deadly for many native Australian animal species that hunt the toads as food. {#blank#}2{#/blank#}

    While some animals have learned to completely avoid the frogs, the Australian monitor lizards continue to be killed by them. The lizards that catch small animals love eating cane toads. {#blank#}3{#/blank#} It takes the cane toad less than 30 seconds to release enough poison to kill a lizard.

{#blank#}4{#/blank#} They decided to train the lizards to avoid the cane toads. To carry out the idea they went to a region of northwestern Australia that had not yet been invaded by cane toads and fed the wild lizards with young cane toads. Though the smaller animals release the same poison as the adults, they do so in smaller amounts. {#blank#}5{#/blank#} The researchers say it took just one or two tests to teach the lizards to stay away from cane toads. They continued to avoid the animals even when the larger cane toads arrived.

A. Not surprisingly, their population has dropped sharply.

B. Unfortunately, in most cases, it turns out to be their last meal.

C. With very few natural enemies, their population began to grow rapidly.

D. Now a team of researchers came up with a good plan to save the lizards.

E. Gradually, the lizards learned to eat only the mildly poisonous cane toads.

F. Therefore, while the poison does make the lizards sick, it does not kill them.

G. That's because cane toads release some deadly poison when they sense danger.