Snow falls in the Earth's extreme North and South throughout the year. However, the heaviest snowfalls have been reported in the mountains of other areas during winter. Snow is even known to fall near the Equator (赤道), but only on the highest mountains.

    Snow contains much less water than rain, but much of the water the world uses comes from snow. {#blank#}1{#/blank#} In the western United States, mountain snow provides up to seventy-five percent of all surface water supplies.

    Snowfall helps to protect plants and some wild animals from winter weather. Fresh snow is made largely of air trapped among the snow crystals (晶体). Because the air has trouble moving, the movement of heat is limited. {#blank#}2{#/blank#} The surface of the snow takes in, or absorbs, sound waves. As snow grows older or if there have been strong winds, it can become hard and flat. Then, the snow's surface will help to send back sound waves.

    {#blank#}3{#/blank#} It is responsible for the deaths of hundreds of people. Many people die in traffic accidents on roads covered with snow and ice or from being seriously stuck in the winter storm. {#blank#}4{#/blank#}.

    People may not be able to avoid living in areas where it snows often. However, they can avoid becoming victims of snowstorms. People should stop driving and stay at home until the storm has passed. People living in these areas should carry emergency supplies in their vehicle. {#blank#}5{#/blank#}

A. These include food, emergency medical supplies, and extra clothing to stay warm and dry.

B. Snow also influences the movement of sound waves.

C. Melting snow provides water for rivers, electric power stations and agricultural crops.

D. Mountain snowfall is heavier than that in the South and the North Poles.

E. In many places, streets were blocked; houses fell down and supplies were short.

F. Others die from heart attacks caused by too much physical activity out in the cold.

G. Snow may be beautiful, but it can be deadly.

    Age has its privileges in America, and one of the more prominent of them is the senior citizen discount. Anyone who has reached a certain age — in some cases as low as 55 — is automatically entitled to dazzling array of price reductions at nearly every level of commercial life. Eligibility is determined not by one's need but by the date on one's birth certificate. Practically unheard of a generation ago, the discounts have become a routine part of many businesses — as common as color televisions in motel rooms and free coffee on airliners.

    People with gray hair often are given the discounts without even asking for them; yet, millions of Americans above age 60 are healthy and solvent(有支付能力的). Businesses that would never dare offer discounts to college students or anyone under 30 freely offer them to older Americans. The practice is acceptable because of the widespread belief that “elderly” and “needy” are synonymous (同义的). Perhaps that once was true, but today elderly Americans as a group have a lower poverty rate than the rest of the population. To be sure, there is economic diversity within the elderly, and many older Americans are poor. But most of them aren't.

    It is impossible to determine the impact of the discounts on individual companies. For many firms, they are a stimulus to revenue. But in other cases the discounts are given at the expense, directly or indirectly, of younger Americans. Moreover, they are a direct irritant in what some politicians and scholars see as a coming conflict between the generations.

    Generational tensions are being fueled by continuing debate over Social Security benefits, which mostly involve a transfer of resources from the young to the old. Employment is another sore point. Buoyed (支持) by laws and court decisions, more and more older Americans are declining the retirement dinner in favor of staying on the job — thereby lessening employment and promotion opportunities for younger workers.

    Far from a kind of charity they once were, senior citizen discounts have become a formidable economic privilege to a group with millions of members who don't need them.

    It no longer makes sense to treat the elderly as a single group whose economic needs deserve priority over those of others. Senior citizen discounts only enhance the myth that older people can't take care of themselves and need special treatment; and they threaten the creation of a new myth, that the elderly are ungrateful and taking for themselves at the expense of children and other age groups. Senior citizen discounts are the essence of the very thing older Americans are fighting against — discrimination by age.

    Many people think only professionals—engineers, accountants, teachers, etc.—have careers.{#blank#}1{#/blank#} Even if you've never had a paid job, you still have a career. Your career is the sum of your life and work. It includes all your activities and experiences. Your schooling, your volunteer work, and even your relationships with your family are all big parts of your career.{#blank#}2{#/blank#}

    During your career, you will have a variety of jobs, occupations and roles. People used to think of a job as full-time, permanent, paid work done for an employer at a work site. But in our changing world, a job is a set of duties or tasks. It can be paid or unpaid{#blank#}3{#/blank#} Even someone who is self-employed has a job.

    An occupation is a group of jobs with similar responsibilities that require a common set of skills.{#blank#}4{#/blank#} Programmers may have permanent or temporary jobs working for specific employers, be self-employed, work full-time or part-time, be paid for their work or volunteer their services. They may change jobs or hold several jobs at one time but, until they change the type of duties or tasks they perform, they are still computer programmers.

    {#blank#}5{#/blank#} We all play a number of roles in our lives and our roles often change over time. For example, Kris works four days a week as a receptionist in a clinic and takes evening courses in social work. She also sews gymnastic wear for her neighbor who sells it at summer markets. Now Kris has at least three roles.

A. A role is a part you play.

B. Actually everyone has a career.

C. In other words, your career is your life story.

D. For example, computer programmer is an occupation.

E. As a matter of fact, a job is different from a role in some way.

F. It can be completed at a work site, at home, or somewhere else.

G. The following is about your work, your family, and your life story.

Habits to Be a Highly Effective Student

    Some students are able to get straight A's and at the same time serve as the president of three clubs. However, some students struggle to keep their GPA (Grade-Point Average) above a 3.0{#blank#}1{#/blank#}Although it's true that everyone's IQ is different, good study habits are very important. Here5re several habits you should adopt to get good grades.

    {#blank#}2{#/blank#} If you haven't had a planner (规划薄), get one. Many people use their computers and smartphones to make a schedule. The problem with that approach is that they are major distractions (分心的事物). Instead, get an old-fashioned paper and pen planner.

    Create a weekly schedule{#blank#}3{#/blank#}Include time that will be spent eating, sleeping and doing anything not related to school work. That way you know exactly how much you can accomplish each day.

    Take frequent, short breaks. Taking a break from studying for 15 minutes every hour will help keep you refreshed{#blank#}4{#/blank#} If you don't take a break, you may find yourself daydreaming or even falling asleep. Take some time for some water, a snack or a quick chat with a friend.

    Take care of yourself. During final exam week, it is common for students to fall behind on sleep and meals. Make sure you get a good night's sleep and have regular meals. Studying while hungry or sleepy is ineffective and will slow you down in the long run. Also try to make time for friends and family{#blank#}5{#/blank#}

A. Keep things organized.

B. Keep away from your computers.

C. Of course, not everyone needs breaks.

D. Our brains are not meant to work for hours nonstop.

E. Having a good support system will help with all the stress.

F. And they seem to spend all of their time in studying.

G. Then under each day, make a list of things to do each hour.

    World records can be set even if you are over 100 years old. Robert Marchand was born in 1911 in northern France. He enjoys riding a bicycle, and started cycling seriously when he was in his 60s. {#blank#}1{#/blank#}

    On Wednesday, a crowd gathered at the Velodrome National, about 30 kilometers outside of Paris. {#blank#}2{#/blank#} The record for one hour is held by Britain's Bradley Wiggins, a former Tour de France winner. Wiggins covered 54.5 kilometers in 2015.Evelyn Stevens of the United States holds the women's record. She went almost 48 kilometers in an hour last year. In 2012, Marchand set a record for riders over 100 years old when he traveled almost 27 kilometers in an hour. {#blank#}3{#/blank#}

    Marchand set off on his record attempt as sports lovers cheered and photographers watched. He moved slowly, but steadily, around the cycling track.

    Marchand is relatively small.{#blank#}4{#/blank#} When the hour ended, he completed 92 times around the track. That is just over 22.5 kilometers. {#blank#}5{#/blank#} He did not see his trainers telling him he only had 10 minutes remaining.“ I would have gone faster. I would have posted a better time,” he said. But the news was still good, as he did set a new record for riders 105-years-old or older.

“I'm now waiting for a rival,” he said.

A. Marchand is now 105 years old.

B. Marchand does well in riding a bicycle.

C. They were there to see how far he could travel in one hour.

D. They knew Marchand could travel over 22.5 kilometers.

E. He is only 1.52 meters tall and weighs 52 kilograms.

F. After the event, Marchand said he could have done better.

G.So the question many people asked this week was: “Could he break his own record?”

    Earth is home to around 7, 000 languages, around half of which are expected to disappear by 2100.

    Languages disappear for many reasons. Sometimes younger generations stop learning a language because parents want children to fit in.{#blank#}1{#/blank#} Native American children of the late﹣19th century were required to attend boarding schools where educators forbade them from speaking their native languages.

    The United Nations ranks endangered languages according to their risk level. For example, a "critically endangered" language is one that even grandparents don't speak often. New York's Onondaga language is an example with only 50 speakers left. An "extinct" language has no speakers. It is gone forever. Alaska's Eyak language is one example.{#blank#}2{#/blank#}

    {#blank#}3{#/blank#} In the same way, different languages contribute to cultural diversity. Saving these languages benefits our understanding of other cultures. Languages can show how a society looks at the world and what it values. A language may describe something in a way that is funny, too. In Welsh, it rains not cats and dogs, but old wives and walking sticks.

    The Endangered Language Alliance wants to save languages from disappearing.{#blank#}4{#/blank#} However, its efforts are limited. If an endangered language is going to make a real comeback, it'll probably get its start in schools. For nearly 100 years, public schools in Hawaii did not teach the Hawaiian language. Now students can keep learning in Hawaiian from elementary schools to college and beyond.

    {#blank#}5{#/blank#} At least one did. In 1881, a Jewish linguist named Eliezer Ben﹣Yehuda brought the 3,000-year-old language Hebrew back to life. Today it is one of the official languages of the country of Israel, with more than 4million speakers.

A. The last person who spoke it died in 2008.

B. Why should we save endangered languages.

C. Various animals and plants benefit our environment.

D. With just 5 speakers left, it is absolutely endangered.

E. Can a language with zero native speakers come back to life.

F. Sometimes societies force minorities to give up their language.

G. The non-profit group finds native speakers and records their stories.