The average computer user has between 5 and 15 username/password combinations to log in different kinds of accounts. Some demand you use a specific number of symbols and digits, while others require you to change your password every 60 days. The feeling of confusion resulting from memorizing these login information has grown so common that it actually has a name: password fatigue(疲劳).

    Having to remember so many different passwords is annoying, but it can also be dangerous. Because it is virtually impossible to remember a unique password for each of these accounts, many people leave handwritten lists of usernames and passwords on or next to their computers.

    {#blank#}1{#/blank#} While these practices make it easier to remember login information, they also make it easier for thieves to hack into accounts.

    Single Sign-On (SSO) confirmation and password management software can help solve this problem. With SSO, users only need to remember one password to log in to the main system.

    {#blank#}2{#/blank#} SSO software is typically used by large companies, schools, or libraries.

    {#blank#}3{#/blank#} If a user loses or forgets the password required to log in to SSO software, the user will then lose access to all of the applications linked to the SSO account. Users who rely on password management software face the same problems.

    Although most websites or network systems allow users to recover or change lost passwords by providing email addresses or answering a prompt（提示）, this process can waste time and cause further frustration. What is more, recovering a forgotten password is only a temporary solution.

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    Some computer scientists have suggested computers rely on biometrics(生物测定学). {#blank#}5{#/blank#} The use of biometrics raises questions concerning privacy and can also be expensive to practice.

    Software engineers and computer security experts are still searching for the cure to password fatigue. Until they find the perfect solution, however, everyone will simply have to rely on the password system currently in place.

    Crossing your legs is an extremely common habit. While you may find it comfortable to sit with one knee crossed over the other, it might be causing health problems that you are not aware of.

    A study published in Blood Pressure Monitoring stated that sitting with your legs crossed can increase your blood pressure. The reason this happens is because the blood in your legs has to work against gravity to be pumped back to your heart, crossing one leg over the other increases resistance, making it even harder for the blood to circulate. You won't feel any immediate effects, but sitting for long periods of time will hurt you forever.

    Crossing your legs can also lead to neck and back pain. Ideally, it's best for our bodies to sit with our feet planted flat, hip width apart, on the floor, but it's not easy to maintain perfect posture all day at the office. When you sit with your legs crossed your hips are in a twisted position, which can cause one of your pelvic bones(骨盆) to rotate. Since your pelvic bone supports your neck and spine（脊椎）, this can cause pressure on your lower and middle back and neck.

    You also might notice that when you sit with your legs crossed for long periods of time your feet and legs get painful or have the feeling of being asleep. This is because when one leg sits on top of the other it causes pressure on the veins（静脉） and nerves in your legs and feet. It can cause numbness and/or temporary paralysis in the legs, ankles, or feet. While the feeling of discomfort may only last a minute or two, repeatedly crossing your legs until they feel numb can cause permanent nerve damage.

    So next time you sit down, try to get yourself in the habit of sitting with both of your feet on the floor. Not only will it help your posture and stability, but it will also save your health in the long run.

    The "best years of your life"? Maybe not. {#blank#}1{#/blank#} .

    ⒈Learn to appreciate small things. Whether it's having a computer, having friends, having a family that loves you, having a decent education or simply being born in this world. {#blank#}2{#/blank#} Be happy, and life will reward you. Remember that these are the last few years you will be able to enjoy yourself without having to worry about the responsibility of an adult, but make sure you prepare yourself for when you do become one.

    ⒉{#blank#}3{#/blank#} Participating in clubs, activities, and sports increases your chances of meeting new friends. While you only need 4 or 5 close friends, that doesn't mean you shouldn't try to meet new people. Participating gives you something to do instead of sitting bored at home and wallowing in self-pity.

    ⒊You can pursue interests you enjoy. Video games, for example, are good if you're the type who can get into that kind of thing. You should also find a hobby that is meaningful or practical. Use your "hobby time" to either A. Volunteer (to gain practical skills for college apps, job resumes, and scholarships) B. Learn an instrument, or get into something else in the creative field like painting or dance.  {#blank#}4{#/blank#} .

    ⒋Play a sport or work out. Having a healthy body leads to a healthy and happy mind. Being confident in your appearance makes you more confident in other areas.

    ⒌Do well in school. {#blank#}5{#/blank#} It will pay off in the end. Plus, doing well means no angry parents. (257)

A. This is the time to start developing and uncovering passions that might otherwise lie inactive.

B. Even though you want to enjoy your teen life as best as possible, don't be lazy in school.

C. But you can learn to make the most of your high school days.

D. Choose your friends wisely.

E. Be sociable.

F. Remember that the point of life is for you to enjoy it.

G. There is nothing more satisfying than seeing your hard work pay off in the form of A's and B's.

How to Plan a Holiday Trip

    {#blank#}1{#/blank#} Whether it's to grandma's house, a family reunion or simply a holiday getaway, these yearly road trips can often be the source of dread and stress. The thought of being trapped in the car with restless children or the possibility of car trouble along the way is enough to make anyone consider staying home. {#blank#}2{#/blank#}

    Plan out the route for your car trip. If you're planning on driving to your holiday destination, a little planning can help make your trip easy and uneventful. {#blank#}3{#/blank#} Remember, it's likely that you won't be the only person on the road during the holidays, and traffic is always a factor. Alternate routes or shortcuts can help reduce time spent in traffic jams and get you to your destination sooner. This information can also come in handy in case of road construction or other situations that might block your primary route.

    {#blank#}4{#/blank#} Although traveling by air can be quick and convenient, it can also be much more expensive. Start planning your trip early to take advantage of advance purchase discounts and avoid sold out flights. Many airlines become extremely busy during the holidays so booking in advance can also help ensure that you get the flights that you want. High traffic destinations such as New York, Los Angeles or Atlanta can be extremely crowded during the holidays. If you have the option, consider booking your flight to a nearby airport and renting a car for the short drive to your destination.

    Consider your luggage needs. If you're traveling by car, the issue of luggage is only important with regards to the amount of room needed. Before you begin packing, think about how many people will be in your vehicle and how much room they will need to travel comfortably. This could affect the number of bags that you can take along. {#blank#}5{#/blank#} Not only is the possibility of lost luggage an issue, but most airlines now charge extra for checked baggage.

    For a family of four, carrying a few bags each could result in several hundred dollars worth of baggage fees during your trip. Try to pack as lightly as possible.

A. As an alternative to driving or flying, check into the possibility of traveling by train.

B. Plan your trip to avoid peak travel times.

C. Luckily, with a little planning, these situations can be avoided.

D. Book airline tickets.

E. Each year, millions of people load up the family car and set out on a holiday trip,

F. For traveling by air, the number of bags that you take is a much bigger concern.

G. Consider your starting point and desired destination, and investigate several possible routes.

    Companion planting is the idea that some kinds of plants can help each other grow. Plants that are compatible (兼容的，能共处的) together generally have similar needs in terms of nutrients, soil and moisture levels.

    Advice about which plants are compatible is sometimes based more on tradition than proof. But experts say there is evidence to support certain combinations. These can improve harvests, reduce disease and help with pest control by attracting helpful insects.

    For example, some kinds of soil bacteria take nitrogen from the air and make it into a form that plants can use. The plants hold the nitrogen in their roots. Legumes (豆科植物) are especially good at this nitrogen (氮) fixing. Then any crops that share the same space with the legumes can get the nitrogen when the roots are broken down.

    Beans and potatoes can also share territory well because their roots reach different levels in the soil. Deep-rooted vegetables get nutrients and moisture from lower down in the soil, so they do not complete with plants with shallower roots.

    But some plants placed together may harm each other's development. For example, tomatoes do not like wet soil but watercress does, so you would probably want to keep them separated.

    Some kinds of produce should be kept apart even after being harvested. This is because of ethylene gas (乙烯气体). Ethylene is a plant hormone (激素) that can cause some foods to ripen too quickly. Apples release ethylene gas. Apricots, melons and tomatoes also release a lot of ethylene. Some vegetables are easily affected by ethylene, including asparagus, broccoli, cabbage and cucumbers.

    This risk of ripening too soon is why markets often separate high ethylene-producing foods from those that are sensitive to the gas. But if you put an apple in a bag with a green banana, the ethylene from the apple will make the banana ready to eat sooner.

    What about peaches, plums and nectarines? These kinds of fruit do not need any help from an apple—they release enough ethylene to ripen themselves. But that does not mean there is no way to get the job done faster.

    Growers suggest placing the fruit in a fruit bowl or in a paper bag with the top folded over. Keep the fruit at room temperature, out of direct sunlight. Once the fruit is soft enough, either use it or put it in the refrigerator to keep it from getting too ripe.

    With the development of technology and economy, social media is becoming one of the fastest-growing industries in today's world. A study conducted by the US Pew Research Centre showed that 92 percent of teenagers go online daily. {#blank#}1{#/blank#}

    Changing relationships.

    High school student Elly Cooper from Illinois said social media often reduces face-to-face communication. "It makes face-to-face relationships harder because people's attention is given to their phones instead of their friends," Cooper said.

    {#blank#}2{#/blank#} Beth Kaplan from Illinois meets her long-distance friend through social media. He currently lives in Scotland, but they're still able to frequently communicate with each other. "I can feel close to someone that I'm talking to via FaceTime," Kaplan said.

    Wanting to be "liked".

    {#blank#}3{#/blank#} The 19-year-old Essena O'Neill announced on the social networking service Instagram that she was quitting social media because it made her unable to stop thinking about appearing perfect online. {#blank#}4{#/blank#} Teenagers who get harmful comments can't help but feel hurt.

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    However, Armin Korsos, a student from Illinois, takes advantage of the comments(评论) he receives over social media to improve his videos on the social networking site YouTube. "Social media can help people show themselves and their talents to the world in a way that has never been possible before," Korsos said.

A. Opening new doors.

B. Teenagers' attitude toward social media.

C. Unpleasant comments can also do great damage to a teenager's self-respect.

D. The wide spread of social media has changed nearly all parts of teenagers' lives.

E. Yet, the social media is beneficial to show people's talents.

F. The rise of social media has changed the way teenagers see themselves.

G. Yet, some people believe social media has made it easier to start relationships with anyone from anywhere.