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Population Change

    Why is the world's population growing？The answer is not what you might think. The reason for the explosion is not that people have been reproducing like rabbits, but that people have stopped dropping dead like flies. In 1900,people died at the average age of 30.By 2000 the average age was 65.But while increasing health was a typical feature of the 20^th century, declining birth rate could be a defining one of the 21^st.

     Statistics show that the average number of births per woman has fallen from 4.9 in the early 1960s to 2.5 nowadays. Furthermore, around 50% of the world's population live in regions where the figure is now below the replacement level(i.e.2.1 births per woman)and almost all developed nations are experiencing sub-replacement birth rate. You might think that developing nations would make up the loss(especially since80% of the world's people now live in such nations),but you'd be wrong, Declining birth rate is a major problem in many developing regions too, which might cause catastrophic global shortages of work force within a few decades.

     A great decline in young work force is likely to occur in China, for instance. What does it imply? First, China needs to undergo rapid economic development before a population decline hits the country. Second, if other factors such as technology remain constant, economic growth and material expectations will fall well below recent standards and this could invite trouble.

     Russia is another country with population problems that could break its economic promise. Since 1992 the number of people dying has been bigger than that of those being born by a massive 50%,Indeed official figures suggest the country has shrunk by 5% since 1993 and people in Russia live a shorter life now than those in 1961.Why is this occurring? Nobody is quite sure, but poor diet an above all long-time alcoholism have much to do with it. If current trends don't bend. Russia's population will be about the size of Yemen's by the year 2050.

     In the north of India, the population is booming due to high birth rates, but in the south, where most economic development is taking place, birth rate is falling rapidly. In a further twist, birth rate is highest in poorly educated rural areas and lowest in highly educated urban areas. In total,25% of India's working-age population has no education. In 2030,a sixth of the country's potential work force could be totally uneducated.

    One solution is obviously to import foreign workers via immigration. As for the USA, it is almost unique among developed nations in having a population that is expected to grow by 20% from 2010-2030,Moreover,the USA has a track record of successfully accepting immigrants. As a result it's likely to see a rise in the size of its working-age population and to witness strong economic growth over the longer term.

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    Why is setting goals important? {#blank#}1{#/blank#} Instead of just letting life happen to you, goals allow you to make your life happen. Successful people imagine how their life should be and set lots of goals.

    By setting goals you are taking control of your life. It's like having a map to show you where you want to go. Think of it this way. There are two drivers. One has a destination in mind which can be found on a map. She can drive straight there surely without any wasted time of wrong turns. {#blank#}2{#/blank#} She starts off at the same time from the same place as the first driver, but she drives aimlessly around, never getting anywhere, just using up gas. Which driver do you want to be?

    Winners in life set goals and follow them through. They decide what they want in life and then get there by making plans and setting goals. {#blank#}3{#/blank#} Goals aren't difficult to set and they aren't difficult to reach.

    {#blank#}4{#/blank#} You are the one who must decide what to achieve and in what direction to aim your life.

    Research tells us that when we write a goal down we are more likely to achieve it. {#blank#}5{#/blank#} Like a contract(合同) with yourself, they are harder to neglect or forget. Also when you write your goals in a particular way, you are able to make yourself continuously aware of situations that will bring you nearer to your goal.

    【1】A safari park is a park in which wild animals are kept. They are mainly located in east or central Africa. They often occupy a very wild area, with mountains and rivers. To visit the park and look at the animals, people have to drive around in a car for a few of hours because the park is huge.

    【2】In south Africa there is a safari park, which contains all sorts of wild animals like lions, elephants, rhinoceroses(犀牛), zebras, wild pigs, deer and giraffes.

    【3】There is a wild road leading through the park, but nobody is permitted to walk on the road. Anyone traveling in the park has to go in a car because wild animals may fiercely attack people. From the car he may see almost every types of African wildlife. Some of these are getting scarce (稀有的) because people kill them for various reasons. For example, rhinoceroses are killed for their horns (角), which are used in traditional Chinese medicines for colds and headaches. Perhaps they will be seen only in museums and books one day.

    【4】Travels may buy food for the animals. They can feed them when they tour the park. Of course, they should not feed them in a close distance because the wild animals may attack people. In addition, they should only give proper food to the animals.

    【5】A traveler may carry a gun with him in his journey. The gun is given to him by the government. However, it is not used for hunting. In fact, a seal(封条) is fixed to it. The traveler may fire at a wild beast to defend himself in case he is attacked. However, he has to prove to the government that he has been attacked and that he has not fired at a harmless animal.

    Perhaps at one point in time, it was acceptable to start any letter or e-mail with “To Whom It May Concern.”{#blank#}1{#/blank#} Starting your cover letter or e-mail for a job this way might give off the impression that you didn't do your research on who you're writing to{#blank#}2{#/blank#}After all, people who address other people by their names when writing and speaking to them tend to be more pleasant.

    {#blank#}3{#/blank#}It can be used in letters of recommendation or reference, formal complaints（抱怨）made to a company, letters of introduction, and letters of interest.

    Grammarly uses the example of needing to write a letter of recommendation, for a colleague who will have to make several copies to distribute to interviewers{#blank#}4{#/blank#}“In most cases, though, try to narrow your focus rather than cast a broad net,” notes Grammarly.”Ask yourself. Who does this e-mail concern? If you can honestly answer 'Anyone, 'then feel free to use “To Whom It May Concern.” （These are the things you should never say in your cover letter.）

    If you do happen to find that using “To Whom It May Concern” is appropriate, don't make grammar mistakes, for example, letters or punctuation.{#blank#}5{#/blank#}

A. However, it maybe interesting.

B. Those times have changed, though.

C. Making mistakes in writing will surely get you low scores.

D. It's also very impersonal, which some employers might not appreciate.

E. In that circumstance, sending and receiving letters is more of a formal greeting.

F. You might want to take note of other common errors you might be committing, too.

G. But according to Grammarly, there are four times when it's OK to use this greeting.

    Eyesight plays a very important role in our daily life. Every waking moment, the eyes are working to see the world around us. Over forty percent of Americans worry about losing eyesight, but it's easy to include steps into our daily life to ensure healthy eyes. Here are five suggestions for a lifetime of healthy eyesight:

    Schedule yearly exams. {#blank#}1{#/blank#}Experts advise parents to bring babies 6 to 12 months of age to the doctor for a careful check. The good news is that millions of children now can have yearly eye exams and following treatment, including eye- glasses.

    Protect against UV rays . Long-term stay in the sun creates risk to your eyes. No matter what the season is, it's extremely important to wear sunglasses. {#blank#}2{#/blank#}

    Give your eyes a break. Two-thirds of Americans spend up to seven hours a day using computers or other digital products. {#blank#}3{#/blank#}Experts recommend that people practice the 20/20/20 rule: every 20 minutes, take a 20-second break and look at something 20 feet away.

    {#blank#}4{#/blank#}As part of a healthy diet, eat more fruits and vegetables each day. Vitamins C and E help protect eyesight and promote eye health.

    Practice safe wear and care of contact lenses (隐形眼镜). Many Americans use contact lenses to improve their eyesight. While some follow the medical guidance for wearing contact lenses, many are breaking the rules and putting their eyesight at risk. {#blank#}5{#/blank#} Otherwise, you may have problems such as red eyes, pain in the eyes, or a more serious condition.

Meal kits(餐具)cut food waste but packaging is a problem

    Home delivery meal kits can slash(大幅消减)food waste by more than two-thirds, but suppliers need to switch to reusable packaging to make them environmentally friendly.

    {#blank#}1{#/blank#} That means leftovers are minimized. But while the delivery services score well on reducing food waste, buying the same ingredients from the supermarket almost always saves energy overall simply because meal kits use so much single-use packaging. The good news is that if you have meals that are tailored for consumption, people won't over-buy and you have less food waste. You fine-tune the portions to what people will actually eat.

    Beyond the cost of the waste itself, thrown-away food generates methane(甲烷)that contributes to climate change. {#blank#}2{#/blank#} A 2018 report from the Boston Consulting Group found that the waste was set to soar by a third by 2030 when global food waste was estimated to reach 2.1 bn tonnes.

    Meal kits can reduce transport emissions if they mean people take fewer trips to the supermarket. If people only went to buy goods that are unlikely to decay such as soap and toilet paper, they might only have to visit the supermarket once every couple of months. That delivery truck can carry meals for you and dozens of neighbors. {#blank#}3{#/blank#}

    The study found that even if delivered meal kits reduced food waste to zero, they would still use up more energy overall than buying the same food from the supermarket unless the energy used for the meal kit packaging was cut by a fifth. {#blank#}4{#/blank#} All the environmental benefits are lost. But if the packaging can be reused, you can get some benefits.

A. However, meal kits are likely heading for the mainstream.

B. If it's single-use and thrown away, the packaging is a killer.

C. In that case, you might replace dozens of car trips with one truck trip.

D. Meal knits arrive on your doorstep by truck filled with every ingredient you need.

E. Tailor-made meal kits save waste by providing precise quantities of fresh ingredients.

F. If food waste was a country, it would rank third in emissions behind the US and China.